Prosperity Bancshares (PB) 10-Q 8 May 24 2024 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 06, 2024
Cover [Abstract]
Entity Registrant Name	PROSPERITY BANCSHARES, INC.
Entity Central Index Key	0001068851
Trading Symbol	PB
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding (in shares)		95,937,934
Entity Current Reporting Status	Yes
Entity File Number	001-35388
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	74-2331986
Entity Address, Address Line One	Prosperity Bank Plaza
Entity Address, Address Line Two	4295 San Felipe
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77027
City Area Code	281
Local Phone Number	269-7199
Entity Shell Company	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock, par value $1.00 per share
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks	$ 1,086,444	$ 458,153
Federal funds sold	250	260
Total cash and cash equivalents	1,086,694	458,413
Available for sale securities, at fair value	315,300	438,588
Held to maturity securities, at cost (fair value of $10,478,359 and $10,984,598, respectively)	11,985,838	12,365,308
Total securities	12,301,138	12,803,896
Loans held for sale	6,380	5,734
Loans held for investment	20,393,943	20,352,559
Loans held for investment - Warehouse Purchase Program	864,924	822,245
Total loans	21,265,247	21,180,538
Less: allowance for credit losses on loans	(330,219)	(332,362)
Loans, net	20,935,028	20,848,176
Accrued interest receivable	97,671	96,327
Goodwill	3,396,402	3,396,086
Core deposit intangibles, net	60,757	63,994
Bank premises and equipment, net	372,333	369,992
Other real estate owned	2,204	1,708
Bank owned life insurance (BOLI)	380,615	379,447
Federal Home Loan Bank of Dallas stock	8,750	8,750
Other assets	114,928	121,088
TOTAL ASSETS	38,756,520	38,547,877
Deposits:
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,648,983	17,403,237
Total deposits	27,175,518	27,179,809
Other borrowings	3,900,000	3,725,000
Securities sold under repurchase agreements	261,671	309,277
Accrued interest payable	75,871	34,819
Allowance for credit losses on off-balance sheet credit exposures	36,503	36,503
Other liabilities	202,413	183,139
Total liabilities	31,651,976	31,468,547
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS’ EQUITY:
Preferred stock, $1 par value; 20,000,000 shares authorized; none issued or outstanding
Common stock, $1 par value; 200,000,000 shares authorized; 93,525,291 issued and outstanding at March 31, 2024; 93,722,383 shares issued and outstanding at December 31, 2023	93,525	93,723
Capital surplus	3,672,090	3,703,795
Retained earnings	3,341,262	3,283,210
Accumulated other comprehensive loss - net unrealized loss on available for sale securities, net of tax benefit of $(620) and $(372), respectively	(2,333)	(1,398)
Total shareholders’ equity	7,104,544	7,079,330
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 38,756,520	$ 38,547,877

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Held to maturity securities, fair value	$ 10,478,359	$ 10,984,598
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)		200,000,000
Common stock, shares issued (in shares)	93,525,291	93,722,383
Common stock, shares outstanding (in shares)	93,525,291	93,722,383
Accumulated other comprehensive loss net unrealized loss on available for sale securities, tax benefit	$ (620)	$ (372)

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
INTEREST INCOME:
Loans, including fees	$ 306,228,000	$ 247,118,000
Securities	66,421,000	73,185,000
Federal funds sold and other earning assets	9,265,000	7,006,000
Total interest income	381,914,000	327,309,000
INTEREST EXPENSE:
Deposits	92,692,000	47,343,000
Other borrowings	48,946,000	34,396,000
Securities sold under repurchase agreements	2,032,000	2,103,000
Total interest expense	143,670,000	83,842,000
NET INTEREST INCOME	238,244,000	243,467,000
PROVISION FOR CREDIT LOSSES	0	0
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	238,244,000	243,467,000
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	8,288,000	8,095,000
Credit card, debit card and ATM card income	8,861,000	8,666,000
Service charges on deposit accounts	6,406,000	5,926,000
Trust income	4,156,000	3,225,000
Mortgage income	610,000	238,000
Brokerage income	1,235,000	1,149,000
Net (loss) gain on sale or write-down of assets	(35,000)	121,000
Net gain on sale of securities	298,000	0
Other	9,051,000	10,846,000
Total noninterest income	38,870,000	38,266,000
NONINTEREST EXPENSE:
Salaries and employee benefits	85,771,000	77,798,000
Net occupancy and equipment	8,623,000	8,025,000
Credit and debit card, data processing and software amortization	10,975,000	9,566,000
Regulatory assessments and FDIC insurance	5,538,000	4,973,000
Core deposit intangibles amortization	3,237,000	2,374,000
Depreciation	4,686,000	4,433,000
Communications	3,402,000	3,462,000
Net other real estate income	49,000	45,000
Merger related expenses	0	860,000
Other	13,567,000	11,464,000
Total noninterest expense	135,848,000	123,000,000
INCOME BEFORE INCOME TAXES	141,266,000	158,733,000
PROVISION FOR INCOME TAXES	30,840,000	34,039,000
NET INCOME	$ 110,426,000	$ 124,694,000
EARNINGS PER SHARE:
Basic	$ 1.18	$ 1.37
Diluted	$ 1.18	$ 1.37

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 110,426	$ 124,694
Securities available for sale:
Change in unrealized loss during the period	(1,184)	(4)
Total other comprehensive loss	(1,184)	(4)
Deferred tax benefit related to other comprehensive income	249	1
Other comprehensive loss, net of tax	(935)	(3)
Comprehensive income	$ 109,491	$ 124,691

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at Dec. 31, 2022	$ 6,699,374	$ 91,314	$ 3,541,924	$ 3,069,609	$ (3,473)
BALANCE (in shares) at Dec. 31, 2022		91,313,615
Net income	124,694			124,694
Other comprehensive loss	(3)				(3)
Common stock issued in connection with the granting of restricted stock awards, net		$ (9)	9
Common stock issued in connection with the granting of restricted stock awards, net (in shares)		(9,250)
Common stock repurchase	(38,040)	$ (611)	(37,429)
Common stock repurchase (in shares)		(611,263)
Stock based compensation expense	3,166		3,166
Cash dividends declared	(50,074)			(50,074)
BALANCE at Mar. 31, 2023	6,739,117	$ 90,694	3,507,670	3,144,229	(3,476)
BALANCE (in shares) at Mar. 31, 2023		90,693,102
BALANCE at Dec. 31, 2023	7,079,330	$ 93,723	3,703,795	3,283,210	(1,398)
BALANCE (in shares) at Dec. 31, 2023		93,722,383
Net income	110,426			110,426
Other comprehensive loss	(935)				(935)
Common stock issued in connection with the granting of restricted stock awards, net		$ 370	(370)
Common stock issued in connection with the granting of restricted stock awards, net (in shares)		370,600
Common stock repurchase	(35,282)	$ (568)	(34,714)
Common stock repurchase (in shares)		(567,692)
Stock based compensation expense	3,379		3,379
Cash dividends declared	(52,374)			(52,374)
BALANCE at Mar. 31, 2024	$ 7,104,544	$ 93,525	$ 3,672,090	$ 3,341,262	$ (2,333)
BALANCE (in shares) at Mar. 31, 2024		93,525,291

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 0.56	$ 0.55

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 110,426,000	$ 124,694,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	7,923,000	6,807,000
Provision for credit losses	0	0
Net amortization of premium on investments	5,822,000	7,384,000
Net gain on sale of investment securities	(298,000)
Net gain on sale of other real estate and repossessed assets	(137,000)	(13,000)
Net loss (gain) on sale or write down of premises and equipment	35,000	(121,000)
Net accretion of discount on loans	(1,860,000)	(872,000)
Net amortization of premium on deposits	(97,000)	(53,000)
Net gain on sale of loans	(612,000)	(239,000)
Proceeds from sale of loans held for sale	24,475,000	8,470,000
Originations of loans held for sale	(24,509,000)	(9,280,000)
Stock based compensation expense	3,379,000	3,166,000
Decrease (increase) in accrued interest receivable and other assets	2,811,000	(66,156,000)
Increase in accrued interest payable and other liabilities	60,042,000	105,986,000
Net cash provided by operating activities	187,400,000	179,773,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities	391,803,000	412,524,000
Purchase of held to maturity securities	(18,947,000)	(3,028,000)
Proceeds from maturities, sales and principal paydowns of available for sale securities	5,631,402,000	2,515,280,000
Purchase of available for sale securities	(5,508,208,000)	(2,527,704,000)
Originations of Warehouse Purchase Program loans	(3,021,378,000)	(2,468,101,000)
Proceeds from pay-offs of Warehouse Purchase Program loans	2,978,699,000	2,409,606,000
Net increase in loans held for investment	(42,737,000)	(434,029,000)
Purchase of bank premises and equipment	(7,184,000)	(10,224,000)
Proceeds from sale of bank premises, equipment and other real estate	838,000	741,000
Proceeds from insurance claims	1,049,000	2,811,000
Net cash provided by (used in) investing activities	405,337,000	(102,124,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in noninterest-bearing deposits	(250,037,000)	(807,100,000)
Net increase (decrease) in interest-bearing deposits	245,843,000	(722,142,000)
Net proceeds from other short-term borrowings	175,000,000	1,515,000,000
Net (decrease) increase in securities sold under repurchase agreements	(47,606,000)	6,127,000
Repurchase of common stock	(35,282,000)	(38,040,000)
Payments of cash dividends	(52,374,000)	(50,074,000)
Net cash provided by (used in) financing activities	35,544,000	(96,229,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	628,281,000	(18,580,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	458,413,000	424,133,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,086,694,000	405,553,000
NONCASH ACTIVITIES:
Acquisition of real estate through foreclosure of collateral	969,000	468,000
SUPPLEMENTAL INFORMATION:
Income taxes paid	487,000	327,000
Interest paid	$ 102,618,000	$ 79,968,000

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 110,426	$ 124,694

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Title	director or officer
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1. BASIS OF PRESENTATION The consolidated financial statements include the accounts of Prosperity Bancshares, Inc. ® (“Bancshares”) and its wholly-owned subsidiary, Prosperity Bank ® (the “Bank,” and together with Bancshares, the “Company”). All intercompany transactions and balances have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for financial information and with the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis; and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Operating results for the three-month period ended March 31, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024 or any other period.

Income Per Common Share

Income Per Common Share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Income Per Common Share	2. INCOME PER COMMON SHARE The following table illustrates the computation of basic and diluted earnings per share: Three Months Ended March 31, 2024 2023 Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 110,426 $ 124,694 Basic: Weighted average shares outstanding 93,706 $ 1.18 91,207 $ 1.37 Diluted: Weighted average shares outstanding 93,706 $ 1.18 91,207 $ 1.37 There were no stock options outstanding at March 31, 2024 or exercisable during the three months ended March 31, 2024 or 2023 that would have had an anti-dilutive effect on the above computation.

New Accounting Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	3. NEW ACCOUNTING STANDARDS Accounting Standards Updates (“ASU”) ASU 2024-01, Compensation — Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards. ASU 2024-01 clarifies the scope application of profits interest and similar awards by adding illustrative guidance to help entities determine whether profits interest and similar awards should be accounted for as share-based payment arrangements within the scope of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 718 , “ Compensation — Stock Compensation .” However, this amendment does not change the intent of that guidance, nor how it should be applied. The ASU’s amendments are effective for fiscal years beginning after December 15, 2024, including interim periods within those years. The Company does not expect ASU 2024-01 to have a significant impact on its financial statements. ASU 2023-09, Income Taxes (Topic 740): Improvements to Income. ASU 2023-09 focuses on the rate reconciliation and income taxes paid and requires a public business entity to disclose, on an annual basis, a tabular rate reconciliation using both percentages and currency amounts, broken out into specified categories with certain reconciling items further broken out by nature and jurisdiction to the extent those items exceed a specified threshold. In addition, all entities are required to disclose income taxes paid, net of refunds received disaggregated by federal, state/local, and foreign and by jurisdiction if the amount is at least 5 % of total income tax payments, net of refunds received. For public business entities the new standard is effective for annual periods beginning after December 15, 2024, with early adoption permitted. An entity may apply the amendments in this ASU prospectively by providing the revised disclosures for the period ending December 31, 2025 and continuing to provide the pre-ASU disclosures for the prior periods, or may apply the amendments retrospectively by providing the revised disclosures for all period presented. The Company does not expect ASU 2023-09 to have an impact on its financial statements. ASU 2023-07, Segment Reporting (Topic 280)—Improvement to Reportable Segment Disclosures . ASU 2023-07 amends the disclosure requirements related to segment reporting primarily through enhanced disclosure about significant segment expenses and by requiring disclosure of segment information on an annual and interim basis. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company does not expect ASU 2023-07 to have a significant impact on its financial statements. ASU 2023-06, Disclosure Improvements—Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative. ASU 2023-06 amends the FASB Accounting Standards Codification to incorporate certain disclosure requirements from SEC Release No. 33-10532 - Disclosure Update and Simplification that was issued in 2018. The effective date for each amendment will be the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. The Company does not expect ASU 2023-06 to have a significant impact on its financial statements. ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The amendments in ASU 2022-02 eliminated the accounting guidance for troubled debt restructurings and enhanced disclosures for certain loan refinancing and restructurings to borrowers experiencing financial difficulty. This guidance was applied on a prospective basis. Additionally, ASU 2022-02 requires entities to disclose current-period gross charge-offs by year of origination. ASU 2022-02 became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s financial statements.

Securities

Securities	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Securities	4. SECURITIES The amortized cost and fair value of investment securities were as follows: March 31, 2024 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available for Sale Corporate debt securities $ 14,350 $ 1,830 $ ( 335 ) $ 15,845 Collateralized mortgage obligations 198,180 — ( 3,374 ) 194,806 Mortgage-backed securities 105,723 58 ( 1,132 ) 104,649 Total $ 318,253 $ 1,888 $ ( 4,841 ) $ 315,300 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,691 $ — $ ( 107 ) $ 7,584 States and political subdivisions 111,699 764 ( 2,581 ) 109,882 Corporate debt securities 12,000 — ( 3,840 ) 8,160 Collateralized mortgage obligations 256,216 — ( 25,076 ) 231,140 Mortgage-backed securities 11,598,232 388 ( 1,477,027 ) 10,121,593 Total $ 11,985,838 $ 1,152 $ ( 1,508,631 ) $ 10,478,359 December 31, 2023 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available for Sale Corporate debt securities $ 20,698 $ 1,827 $ ( 738 ) $ 21,787 Collateralized mortgage obligations 321,881 967 ( 2,804 ) 320,044 Mortgage-backed securities 97,779 96 ( 1,118 ) 96,757 Total $ 440,358 $ 2,890 $ ( 4,660 ) $ 438,588 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,631 $ — $ ( 52 ) $ 7,579 States and political subdivisions 116,497 1,864 ( 2,306 ) 116,055 Corporate debt securities 12,000 — ( 4,200 ) 7,800 Collateralized mortgage obligations 263,250 — ( 20,864 ) 242,386 Mortgage-backed securities 11,965,930 2,131 ( 1,357,283 ) 10,610,778 Total $ 12,365,308 $ 3,995 $ ( 1,384,705 ) $ 10,984,598 The investment securities portfolio is measured for expected credit losses by segregating the portfolio into two general classifications and applying the appropriate expected credit losses methodology. Investment securities classified as available for sale or held to maturity are evaluated for expected credit losses under FASB ASC 326 ,“Financial Instruments – Credit Losses.” Available for sale securities . For available for sale securities in an unrealized loss position, the amount of the expected credit losses recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the expected credit losses will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the expected credit losses will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total expected credit losses related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis and such difference is recognized in earnings. The amount of the total expected credit losses related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the expected credit losses recognized in earnings will become the new amortized cost basis of the investment. As of March 31, 2024, management does not have the intent to sell any of the securities classified as available for sale before a recovery of cost. In addition, management believes it is more likely than not that the Company will not be required to sell any of its investment securities before a recovery of cost. The unrealized losses are largely due to changes in market interest rates and spread relationships since the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date, or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of March 31, 2024, management believes that there is no potential for credit losses on available for sale securities. Held to maturity securities . The Company’s held to maturity investments include mortgage-related bonds issued by either the Government National Mortgage Corporation (“Ginnie Mae”), Federal National Mortgage Association (“Fannie Mae”) or Federal Home Loan Mortgage Corporation (“Freddie Mac”). Ginnie Mae issued securities are explicitly guaranteed by the U.S. government, while Fannie Mae and Freddie Mac issued securities are fully guaranteed by those respective United States government-sponsored agencies and conditionally guaranteed by the full faith and credit of the United States. The Company’s held to maturity securities also include taxable and tax-exempt municipal securities issued primarily by school districts, utility districts and municipalities located in Texas. The Company’s investment in municipal securities is exposed to credit risk. The securities are highly rated by major rating agencies and regularly reviewed by management. A significant portion are guaranteed or insured by either the Texas Permanent School Fund, Assured Guaranty or Build America Mutual. As of March 31, 2024, the Company’s municipal securities represent 0.9 % of the securities portfolio. Management has the ability and intent to hold the securities classified as held to maturity until they mature, at which time the Company will receive full value for the securities. Accordingly, as of March 31, 2024 , management believes that there is no potential for material credit losses on held to maturity securities. Securities with unrealized losses, segregated by length of time, that have been in a continuous loss position were as follows: March 31, 2024 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) Available for Sale Corporate debt securities $ 5,265 $ ( 335 ) $ — $ — $ 5,265 $ ( 335 ) Collateralized mortgage obligations 58,266 ( 874 ) 136,540 ( 2,500 ) 194,806 ( 3,374 ) Mortgage-backed securities 10,043 ( 60 ) 91,458 ( 1,072 ) 101,501 ( 1,132 ) Total $ 73,574 $ ( 1,269 ) $ 227,998 $ ( 3,572 ) $ 301,572 $ ( 4,841 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,583 $ ( 107 ) $ — $ — $ 7,583 $ ( 107 ) States and political subdivisions 14,877 ( 68 ) 54,906 ( 2,513 ) 69,783 ( 2,581 ) Corporate debt securities — — 8,160 ( 3,840 ) 8,160 ( 3,840 ) Collateralized mortgage obligations 47,876 ( 1,261 ) 183,228 ( 23,815 ) 231,104 ( 25,076 ) Mortgage-backed securities 147,256 ( 1,836 ) 9,900,482 ( 1,475,191 ) 10,047,738 ( 1,477,027 ) Total $ 217,592 $ ( 3,272 ) $ 10,146,776 $ ( 1,505,359 ) $ 10,364,368 $ ( 1,508,631 ) December 31, 2023 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) Available for Sale Corporate debt securities $ 7,300 $ ( 738 ) $ — $ — $ 7,300 $ ( 738 ) Collateralized mortgage obligations 54,611 ( 729 ) 114,758 ( 2,075 ) 169,369 ( 2,804 ) Mortgage-backed securities 1,154 ( 13 ) 92,211 ( 1,105 ) 93,365 ( 1,118 ) Total $ 63,065 $ ( 1,480 ) $ 206,969 $ ( 3,180 ) $ 270,034 $ ( 4,660 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,580 $ ( 52 ) $ — $ — $ 7,580 $ ( 52 ) States and political subdivisions 23,085 ( 79 ) 41,039 ( 2,227 ) 64,124 ( 2,306 ) Corporate debt securities — — 7,800 ( 4,200 ) 7,800 ( 4,200 ) Collateralized mortgage obligations 50,147 ( 470 ) 192,205 ( 20,394 ) 242,352 ( 20,864 ) Mortgage-backed securities 52,853 ( 807 ) 10,354,514 ( 1,356,476 ) 10,407,367 ( 1,357,283 ) Total $ 133,665 $ ( 1,408 ) $ 10,595,558 $ ( 1,383,297 ) $ 10,729,223 $ ( 1,384,705 ) At March 31, 2024 and December 31, 2023 , there were 1,028 securities and 941 securities, respectively, in an unrealized loss position for 12 months or more. The table below summarizes the amortized cost and fair value of investment securities at March 31, 2024, by contractual maturity. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations at any time with or without call or prepayment penalties. Held to Maturity Available for Sale Amortized Cost Fair Value Amortized Cost Fair Value (Dollars in thousands) Due in one year or less $ 27,214 $ 27,560 $ — $ — Due after one year through five years 45,853 45,608 — — Due after five years through ten years 46,427 41,573 14,350 15,845 Due after ten years 11,896 10,885 — — Subtotal 131,390 125,626 14,350 15,845 Mortgage-backed securities and collateralized mortgage obligations 11,854,448 10,352,733 303,903 299,455 Total $ 11,985,838 $ 10,478,359 $ 318,253 $ 315,300 The Company recorded a $ 298 thousand net gain on the sale of securities for the three months ended March 31, 2024 and no gain or loss on the sale of securities for the three months ended March 31, 2023. As of March 31, 2024, the Company did not own any non-agency collateralized mortgage obligations. At March 31, 2024 and December 31, 2023 , the Company did not own securities of any one issuer (other than the U.S. government and its agencies) for which aggregate adjusted cost exceeded 10 % of the consolidated shareholders’ equity at such respective dates. Securities with an amortized cost of $ 10.99 billion and $ 11.34 billion and a fair value of $ 9.60 billion and $ 10.09 billion at March 31, 2024 and December 31, 2023 , respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Loans and Allowance for Credit Losses	5. LOANS AND ALLOWANCE FOR CREDIT LOSSES The loan portfolio consists of various types of loans and is categorized by major type as follows: March 31, 2024 December 31, 2023 (Dollars in thousands) Residential mortgage loans held for sale $ 6,380 $ 5,734 Commercial and industrial 2,470,848 2,305,040 Real estate: Construction, land development and other land loans 2,876,588 3,076,591 1-4 family residential (includes home equity) 8,275,040 8,162,344 Commercial real estate (includes multi-family residential) 5,631,460 5,662,948 Farmland 590,896 598,898 Agriculture 222,196 217,145 Consumer and other 326,915 329,593 Total loans held for investment, excluding Warehouse Purchase Program 20,393,943 20,352,559 Warehouse Purchase Program 864,924 822,245 Total loans, including Warehouse Purchase Program $ 21,265,247 $ 21,180,538 Concentrations of Credit. Most of the Company’s lending activity occurs within the states of Texas and Oklahoma. Commercial real estate loans, 1-4 family residential loans and construction, land development and other land loans made up 82.3 % and 83.0 % of the Company’s total loan portfolio, excluding Warehouse Purchase Program loans, at March 31, 2024 and December 31, 2023, respectively. As of March 31, 2024 and December 31, 2023 , excluding Warehouse Purchase Program loans, there were no concentrations of loans related to any single industry in excess of 10 % of total loans. Related Party Loans. As of March 31, 2024 and December 31, 2023 , loans outstanding to directors, officers and their affiliates totaled $ 290 thousand and $ 292 thousand, respectively. All transactions between the Company and such related parties are conducted in the ordinary course of business and made on the same terms and conditions as similar transactions with unaffiliated persons. An analysis of activity with respect to these related party loans is as follows: As of and for the As of and for the 31, 2023 (Dollars in thousands) Beginning balance on January 1 $ 292 $ 547 New loans 1 64 Repayments ( 3 ) ( 319 ) Ending balance $ 290 $ 292 Nonperforming Assets and Nonaccrual and Past Due Loans. The Company has several procedures in place to assist it in maintaining the overall quality of its loan portfolio. The Company has established underwriting guidelines to be followed by its officers, including requiring appraisals on loans collateralized by real estate. The Company also monitors its delinquency levels for any negative or adverse trends. Nevertheless, the Company’s loan portfolio could become subject to increasing pressures from deteriorating borrower credit due to general economic conditions. The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases; unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured, which is typically evidenced by a sustained period (at least six months) of repayment performance by the borrower. With respect to potential problem loans, an evaluation of the borrower’s overall financial condition is made, together with an appraisal for loans collateralized by real estate, to determine the need, if any, for possible write-downs or appropriate additions to the allowance for credit losses. An aging analysis of past due loans, segregated by category of loan, is presented below: March 31, 2024 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans Total Loans (Dollars in thousands) Construction, land development and other land loans $ 17,078 $ — $ 17,078 $ 14,749 $ 2,844,761 $ 2,876,588 Warehouse Purchase Program loans — — — — 864,924 864,924 Agriculture and agriculture real estate (includes farmland) 3,672 428 4,100 3,286 805,706 813,092 1-4 family (includes home equity) (1) 37,462 — 37,462 29,464 8,214,494 8,281,420 Commercial real estate (includes multi-family residential) 13,036 2,417 15,453 21,303 5,594,704 5,631,460 Commercial and industrial 20,715 190 20,905 9,542 2,440,401 2,470,848 Consumer and other 432 — 432 131 326,352 326,915 Total $ 92,395 $ 3,035 $ 95,430 $ 78,475 $ 21,091,342 $ 21,265,247 December 31, 2023 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans Total Loans (Dollars in thousands) Construction, land development and other land loans $ 21,627 $ 1,635 $ 23,262 $ 14,770 $ 3,038,559 $ 3,076,591 Warehouse Purchase Program loans — — — — 822,245 822,245 Agriculture and agriculture real estate (includes farmland) 8,572 — 8,572 1,460 806,011 816,043 1-4 family (includes home equity) (1) 38,350 130 38,480 25,694 8,103,904 8,168,078 Commercial real estate (includes multi-family residential) 23,511 — 23,511 18,662 5,620,775 5,662,948 Commercial and industrial 14,782 430 15,212 8,066 2,281,762 2,305,040 Consumer and other 503 — 503 36 329,054 329,593 Total $ 107,345 $ 2,195 $ 109,540 $ 68,688 $ 21,002,310 $ 21,180,538 (1) Includes $ 6.4 million and $ 5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023 , respectively. The following table presents information regarding nonperforming assets as of the dates indicated: March 31, 2024 December 31, 2023 (Dollars in thousands) Nonaccrual loans (1) (2) $ 78,475 $ 68,688 Accruing loans 90 or more days past due 3,035 2,195 Total nonperforming loans 81,510 70,883 Repossessed assets 97 76 Other real estate 2,204 1,708 Total nonperforming assets $ 83,811 $ 72,667 Nonperforming assets to total loans and other real estate 0.39 % 0.34 % Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.41 % 0.36 % Nonaccrual loans to total loans 0.37 % 0.32 % Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.38 % 0.34 % (1) ASU 2022-02 became effective for the Company on January 1, 2023. (2) There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented. The Company had $ 83.8 million in nonperforming assets at March 31, 2024 compared with $ 72.7 million at December 31, 2023. Nonperforming assets were 0.39 % of total loans and other real estate at March 31, 2024 and 0.34 % of total loans and other real estate at December 31, 2023. The Company had $ 78.5 million in nonaccrual loans at March 31, 2024 compared with $ 68.7 million at December 31, 2023. Acquired Loans. Acquired loans were preliminarily recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default, and recovery rates. Projected default rates, loss given default, and recovery rates for purchased credit deteriorated (“PCD”) loans primarily impact the related allowance, as opposed to the fair value mark. During the valuation process, the Company identified PCD and Non-PCD loans in the acquired loan portfolios. Loans acquired with evidence of credit quality deterioration since origination as of the acquisition date were accounted for as PCD. PCD loan identification considers the following factors: payment history and past due status, debt service coverage, loan grading, collateral values and other factors that may indicate deterioration of credit quality as of the acquisition date when compared to the origination date. Non-PCD loan identification considers the following factors: account types, remaining terms, annual interest rates or coupons, current market rates, interest types, past delinquencies, timing of principal and interest payments, loan to value ratios, loss exposures and remaining balances. Accretion of purchased discounts on PCD and Non-PCD loans will be recognized based on payment structure and the contractual maturity of individual loans. PCD Loans. The recorded investment in PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 (Dollars in thousands) PCD loans: Outstanding balance $ 495,074 $ 533,653 Discount ( 7,361 ) ( 7,914 ) Recorded investment $ 487,713 $ 525,739 Changes in the accretable yield for acquired PCD loans for the three months ended March 31, 2024 and 2023 were as follows: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ 7,914 $ 3,361 Accretion charge-offs ( 5 ) — Accretion ( 548 ) ( 339 ) Balance at March 31, $ 7,361 $ 3,022 Income recognition on PCD loans is subject to the timing and amount of future cash flows. PCD loans for which the Company is accruing interest income are not considered nonperforming or impaired. The PCD discount reflected above as of March 31, 2024, represents the amount of discount available to be recognized as income. Non-PCD Loans. The recorded investment in Non-PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 (Dollars in thousands) Non-PCD loans: Outstanding balance $ 1,676,563 $ 1,823,809 Discount ( 18,681 ) ( 19,992 ) Recorded investment $ 1,657,882 $ 1,803,817 Changes in the discount accretion for Non-PCD loans for the three months ended March 31, 2024 and 2023 were as follows: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ 19,992 $ 2,233 Accretion recoveries 1 — Accretion ( 1,312 ) ( 532 ) Balance at March 31, $ 18,681 $ 1,701 Credit Quality Indicators. As part of the ongoing monitoring of the credit quality of the Company’s loan portfolio and methodology for calculating the allowance for credit losses, management assigns and tracks loan grades to be used as credit quality indicators. The following is a general description of the loan grades used: Grade 1— Credits in this category have risk potential that is virtually nonexistent. These loans may be secured by insured certificates of deposit, insured savings accounts, U.S. Government securities and highly rated municipal bonds. Grade 2— Credits in this category are of the highest quality. These borrowers represent top rated companies and individuals with unquestionable financial standing with excellent global cash flow coverage, net worth, liquidity and collateral coverage. Grade 3— Credits in this category are not immune from risk but are well protected by the collateral and paying capacity of the borrower. These loans may exhibit a minor unfavorable credit factor, but the overall credit is sufficiently strong to minimize the possibility of loss. Grade 4— Credits in this category are considered to be of acceptable credit quality with moderately greater risk than Grade 3 and receiving closer monitoring. Loans in this category have sources of repayment that remain sufficient to preclude a larger than normal probability of default and secondary sources are likewise currently of sufficient quantity, quality, and liquidity to protect the Company against loss of principal and interest. These borrowers have specific risk factors, but the overall strength of the credit is acceptable based on other mitigating credit and/or collateral factors and can repay the debt in the normal course of business. Grade 5— Credits in this category constitute an undue and unwarranted credit risk; however, the factors do not rise to a level of substandard. These credits have potential weaknesses and/or declining trends that, if not corrected, could expose the Company to risk at a future date. These loans are monitored on the Company’s internally-generated watch list and evaluated on a quarterly basis. Grade 6— Credits in this category are considered “substandard” but “non-impaired” loans in accordance with regulatory guidelines. Loans in this category have well-defined weakness that, if not corrected, could make default of principal and interest possible. Loans in this category are still accruing interest and may be dependent upon secondary sources of repayment and/or collateral liquidation. Grade 7— Credits in this category are deemed “substandard” and “impaired” pursuant to regulatory guidelines. As such, the Company has determined that it is probable that less than 100% of the contractual principal and interest will be collected. These loans are individually evaluated for a specific reserve and will typically have the accrual of interest stopped. Grade 8— Credits in this category include “doubtful” loans in accordance with regulatory guidance. Such loans are no longer accruing interest and factors indicate a loss is imminent. These loans are also deemed “impaired.” While a specific reserve may be in place while the loan and collateral are being evaluated, these loans are typically charged down to an amount the Company estimates is collectible. Grade 9— Credits in this category are deemed a “loss” in accordance with regulatory guidelines and have been charged off or charged down. The Company may continue collection efforts and may have partial recovery in the future. The following tables present loans by risk grade, by category of loan and year of origination/renewal at March 31, 2024. Term Loans Amortized Cost Basis by Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Construction, Land Development and Other Land Loans Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — 1,106 166 — — 14 — — 1,286 Grade 3 103,359 745,828 696,969 364,477 215,354 57,308 119,072 — 2,302,367 Grade 4 3,478 83,562 146,216 42,544 5,572 26,944 30,782 — 339,098 Grade 5 — — 1,357 — 23,373 15,796 769 — 41,295 Grade 6 — 570 — 7,698 184 561 — — 9,013 Grade 7 — 183 2,647 343 — 242 248 — 3,663 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 1,218 29,616 98,450 15,171 7,649 7,371 20,391 — 179,866 Total $ 108,055 $ 860,865 $ 945,805 $ 430,233 $ 252,132 $ 108,236 $ 171,262 $ — $ 2,876,588 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Agriculture and Agriculture Real Estate (includes Farmland) Grade 1 $ 720 $ 1,179 $ 1,231 $ 172 $ 252 $ 369 $ 8,590 $ — $ 12,513 Grade 2 — 13 60 101 — 722 46 — 942 Grade 3 20,051 126,212 168,180 76,630 47,924 118,858 102,641 94 660,590 Grade 4 3,436 21,435 19,644 25,993 4,122 9,589 21,807 — 106,026 Grade 5 725 57 799 885 — 1,143 — — 3,609 Grade 6 — — — 78 — 1,195 — — 1,273 Grade 7 — — 1,469 558 339 29 — — 2,395 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 1,986 2,532 1,345 14,558 2,630 2,693 — 25,744 Total $ 24,932 $ 150,882 $ 193,915 $ 105,762 $ 67,195 $ 134,535 $ 135,777 $ 94 $ 813,092 Current-period gross write-offs $ — $ — $ — $ — $ — $ 121 $ — $ — $ 121 1-4 Family (includes Home Equity) (1) Grade 1 $ — $ 74 $ 153 $ — $ 109 $ — $ — $ — $ 336 Grade 2 — 526 1,243 153 236 2,602 — — 4,760 Grade 3 109,256 1,172,870 2,253,123 2,140,728 1,021,887 1,310,779 91,597 2,757 8,102,997 Grade 4 1,178 15,265 15,813 25,722 5,681 64,138 2,871 204 130,872 Grade 5 — — 1,206 — 119 2,517 — — 3,842 Grade 6 — — 357 41 19 1,840 — — 2,257 Grade 7 — 1,744 7,554 5,304 4,433 9,293 95 — 28,423 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 625 4,243 475 469 2,121 — — 7,933 Total $ 110,434 $ 1,191,104 $ 2,283,692 $ 2,172,423 $ 1,032,953 $ 1,393,290 $ 94,563 $ 2,961 $ 8,281,420 Current-period gross write-offs $ — $ — $ 389 $ — $ 33 $ 39 $ — $ — $ 461 Term Loans Amortized Cost Basis by Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Commercial Real Estate (includes Multi-Family Residential) Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — 1,128 — 459 2,232 — — 3,819 Grade 3 50,492 403,245 908,841 680,193 405,589 1,246,771 77,627 4,591 3,777,349 Grade 4 2,667 43,104 262,140 172,287 217,796 716,336 15,857 — 1,430,187 Grade 5 — 192 2,538 4,771 — 89,422 2,355 — 99,278 Grade 6 — — — 356 11,451 76,088 — — 87,895 Grade 7 — 1,693 827 2,464 — 806 — — 5,790 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 540 13,613 53,166 49,281 38,547 71,666 329 — 227,142 Total $ 53,699 $ 461,847 $ 1,228,640 $ 909,352 $ 673,842 $ 2,203,321 $ 96,168 $ 4,591 $ 5,631,460 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Commercial and Industrial Grade 1 $ 6,392 $ 15,267 $ 9,372 $ 6,418 $ 2,811 $ 6,188 $ 41,360 $ 176 $ 87,984 Grade 2 — 695 7,799 219 195 3,651 2,295 — 14,854 Grade 3 211,874 206,299 222,945 147,665 49,661 187,230 910,134 30,276 1,966,084 Grade 4 20,633 44,614 30,936 14,641 11,286 110,319 65,063 2,222 299,714 Grade 5 — 17 21,827 6,057 1,666 788 8,200 100 38,655 Grade 6 413 311 3,898 615 354 962 2,390 — 8,943 Grade 7 — 3,900 420 195 1,268 1,416 457 — 7,656 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 3,689 14,070 3,637 661 2,439 22,462 — 46,958 Total $ 239,312 $ 274,792 $ 311,267 $ 179,447 $ 67,902 $ 312,993 $ 1,052,361 $ 32,774 $ 2,470,848 Current-period gross write-offs $ — $ 53 $ 349 $ 39 $ — $ 24 $ 895 $ — $ 1,360 Consumer and Other Grade 1 $ 4,614 $ 12,520 $ 5,465 $ 2,813 $ 1,681 $ 5,914 $ 2,588 $ — $ 35,595 Grade 2 6,132 12,406 14,181 — — 1,839 1,507 — 36,065 Grade 3 24,054 40,317 38,129 24,769 11,901 17,352 75,004 11 231,537 Grade 4 — 1,748 257 1,105 15,259 2,255 2,865 — 23,489 Grade 5 — — — — — — — — — Grade 6 — — 31 5 — — — — 36 Grade 7 — — — — 122 1 — — 123 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — 34 7 15 14 — 70 Total $ 34,800 $ 66,991 $ 58,063 $ 28,726 $ 28,970 $ 27,376 $ 81,978 $ 11 $ 326,915 Current-period gross write-offs $ 1,470 $ 20 $ 17 $ 24 $ — $ 70 $ 58 $ — $ 1,659 Term Loans Amortized Cost Basis by Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Warehouse Purchase Program Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — — — — — — — — Grade 3 864,924 — — — — — — — 864,924 Grade 4 — — — — — — — — — Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 864,924 $ — $ — $ — $ — $ — $ — $ — $ 864,924 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Total Grade 1 $ 11,726 $ 29,040 $ 16,221 $ 9,403 $ 4,853 $ 12,471 $ 52,538 $ 176 $ 136,428 Grade 2 6,132 14,746 24,577 473 890 11,060 3,848 — 61,726 Grade 3 1,384,010 2,694,771 4,288,187 3,434,462 1,752,316 2,938,298 1,376,075 37,729 17,905,848 Grade 4 31,392 209,728 475,006 282,292 259,716 929,581 139,245 2,426 2,329,386 Grade 5 725 266 27,727 11,713 25,158 109,666 11,324 100 186,679 Grade 6 413 881 4,286 8,793 12,008 80,646 2,390 — 109,417 Grade 7 — 7,520 12,917 8,864 6,162 11,787 800 — 48,050 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 1,758 49,529 172,461 69,943 61,891 86,242 45,889 — 487,713 Total $ 1,436,156 $ 3,006,481 $ 5,021,382 $ 3,825,943 $ 2,122,994 $ 4,179,751 $ 1,632,109 $ 40,431 $ 21,265,247 Current-period gross write-offs $ 1,470 $ 73 $ 755 $ 63 $ 33 $ 254 $ 953 $ — $ 3,601 (1) Includes $ 6.4 million of residential mortgage loans held for sale at March 31, 2024 . Allowance for Credit Losses on Loans. The allowance for credit losses is adjusted through charges to earnings in the form of a provision for credit losses. Management has established an allowance for credit losses which it believes is adequate as of March 31, 2024 for estimated losses in the Company’s loan portfolio. The amount of the allowance for credit losses on loans is affected by the following: (1) charge-offs of loans that occur when loans are deemed uncollectible and decrease the allowance, (2) recoveries on loans previously charged off that increase the allowance, (3) provisions for credit losses charged to earnings that increase the allowance, and (4) provision releases returned to earnings that decrease the allowance. Based on an evaluation of the loan portfolio and consideration of the factors listed below, management presents a quarterly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. Although management believes it uses the best information available to make determinations with respect to the allowance for credit losses, future adjustments may be necessary if economic conditions or borrower performance differ from the assumptions used in making the initial determinations. The Company’s allowance for credit losses on loans consists of two components: (1) a specific valuation allowance based on expected losses on specifically identified loans and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions and other qualitative risk factors both internal and external to the Company. In setting the specific valuation allowance, the Company follows a loan review program to evaluate the credit risk in the total loan portfolio and assigns risk grades to each loan. Through this loan review process, the Company maintains an internal list of impaired loans, which along with the delinquency list of loans, helps management assess the overall quality of the loan portfolio and the adequacy of the allowance for credit losses. All loans that have been identified as impaired are reviewed on a quarterly basis in order to determine whether a specific reserve is required. For certain impaired loans, the Company allocates a specific loan loss reserve primarily based on the value of the collateral securing the impaired loan in accordance with ASC Topic 326-20, “ Financial Instruments – Credit Losses. ” The specific reserves are determined on an individual loan basis. Loans for which specific reserves are provided are excluded from the general valuation allowance described below. In connection with this review of the loan portfolio, the Company considers risk elements attributable to particular loan types or categories in assessing the quality of individual loans. Some of the risk elements include: • for 1-4 family residential mortgage loans, the borrower’s ability to repay the loan, including a consideration of the debt to income ratio and employment and income stability, the loan to value ratio, and the age, condition and marketability of collateral; • for commercial real estate loans and multifamily residential loans, the debt service coverage ratio (income from the property in excess of operating expenses compared to loan payment requirements), operating results of the owner in the case of owner-occupied properties, the loan to value ratio, the age and condition of the collateral and the volatility of income, property value and future operating results typical of properties of that type; • for construction, land development and other land loans, the perceived feasibility of the project including the ability to sell developed lots or improvements constructed for resale or the ability to lease property constructed for lease, the quality and nature of contracts for presale or prelease, if any, experience and ability of the developer and loan to value ratio; • for commercial and industrial loans, the operating results of the commercial, industrial or professional enterprise, the borrower’s business, professional and financial ability and expertise, the specific risks and volatility of income and operating results typical for businesses in that category and the value, nature and marketability of collateral; • for the Warehouse Purchase Program, the capitalization and liquidity of the mortgage banking client, the operating experience, the client’s satisfactory underwriting of purchased loans and the consistent timeliness by the client of loan resale to investors; • for agriculture real estate loans, the experience and financial capability of the borrower, projected debt service coverage of the operations of the borrower and loan to value ratio; and • for non-real estate agriculture loans, the operating results, experience and financial capability of the borrower, historical and expected market conditions and the value, nature and marketability of collateral. In addition, for each category, the Company considers secondary sources of income and the financial strength and credit history of the borrower and any guarantors. In determining the amount of the general valuation allowance, management considers factors such as historical lifetime loan loss experience, concentration risk of specific loan types, the volume, growth and composition of the Company’s loan portfolio, current economic conditions and reasonable and supportable forecasted economic conditions that may affect borrower ability to pay and the value of collateral, the evaluation of the Company’s loan portfolio through its internal loan review process, other qualitative risk factors both internal and external to the Company and other relevant factors in accordance with ASC Topic 326, “ Financial Instruments – Credit Losses.” Historical lifetime loan loss experience is determined by utilizing an open-pool (“cumulative loss rate”) methodology. Adjustments to the historical lifetime loan loss experience are made for differences in current loan pool risk characteristics such as portfolio concentrations, delinquency, non-accrual, and watch list levels, as well as changes in current and forecasted economic conditions such as unemployment rates, property and collateral values, and other indices relating to economic activity. The utilization of reasonable and supportable forecasts includes an immediate reversion to lifetime historical loss rates. Based on a review of these factors for each loan type, the Company applies an estimated percentage to the outstanding balance of each loan type, excluding any loan that has a specific reserve. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. The following table details activity in the allowance for credit losses on loans by category of loan for the three months ended March 31, 2024 and 2023. Construction, Land Development and Other Land Loans Agriculture and Agriculture Real Estate (includes Farmland) 1-4 Family (includes Home Equity) Commercial Real Estate (includes Multi-Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Allowance for credit losses on loans: Three Months Ended Balance December 31, 2023 $ 87,775 $ 11,380 $ 77,652 $ 88,664 $ 59,832 $ 7,059 $ 332,362 Provision for credit losses on loans ( 5,619 ) 1,270 2,469 ( 1,468 ) 2,067 1,281 — Charge-offs — ( 121 ) ( 461 ) — ( 1,360 ) ( 1,659 ) ( 3,601 ) Recoveries 2 98 4 17 1,077 260 1,458 Net (charge-offs) recoveries 2 ( 23 ) ( 457 ) 17 ( 283 ) ( 1,399 ) ( 2,143 ) Balance March 31, 2024 $ 82,158 $ 12,627 $ 79,664 $ 87,213 $ 61,616 $ 6,941 $ 330,219 Allowance for credit losses on loans: Three Months Ended Balance December 31, 2022 $ 78,853 $ 7,699 $ 60,795 $ 66,272 $ 62,319 $ 5,638 $ 281,576 Provision for credit losses 1,695 356 1,603 1,699 ( 6,495 ) 1,142 — Charge-offs — — ( 65 ) — ( 901 ) ( 1,225 ) ( 2,191 ) Recoveries 13 6 205 1 2,373 208 2,806 Net (charge-offs) recoveries 13 6 140 1 1,472 ( 1,017 ) 615 Balance March 31, 2023 $ 80,561 $ 8,061 $ 62,538 $ 67,972 $ 57,296 $ 5,763 $ 282,191 The allowance for credit losses on loans as of March 31, 2024 totaled $ 330.2 million or 1.55 % of total loans, including acquired loans with discounts, a decrease of $ 2.1 million or 0.6 % compared to the allowance for credit losses on loans totaling $ 332.4 million or 1.57 % of total loans, including acquired loans with discounts, as of December 31, 2023 . There was no provision for credit losses for the three months ended March 31, 2024 and 2023. Net charge-offs were $ 2.1 million for the three months ended March 31, 2024 compared to net recoveries of $ 615 thousand for the three months ended March 31, 2023. Net charge-offs for the three months ended March 31, 2024 included $ 991 thousand related to resolved PCD loans, which had specific reserves that were allocated to the charge-offs. Further, an additional $ 4.1 million of specific reserves on resolved PCD loans without any related charge-offs was released to the general reserve. Allowance for Credit Losses on Off-Balance Sheet Credit Exposures. The allowance for credit losses on off-balance sheet credit exposures estimates expected credit losses over the contractual period in which there is exposure to credit risk via a contractual obligation to extend credit, except when an obligation is unconditionally cancellable by the Company. The allowance is adjusted by provisions for credit losses charged to earnings that increase the allowance, or by provision releases returned to earnings that decrease the allowance. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on the commitments expected to fund. The estimate of commitments expected to fund is affected by historical analysis of utilization rates. The expected credit loss rates applied to the commitments expected to fund are affected by the general valuation allowance utilized for outstanding balances with the same underlying assumptions and drivers. As of March 31, 2024 and December 31, 2023, the Company had $ 36.5 million in allowance for credit losses on off-balance sheet credit exposures. T he allowance for credit losses on off-balance sheet credit exposures is a separate line item on the Company’s consolidated balance sheet. As of March 31, 2024, the Company ha d $ 2.26 billion in commit ments expected to fund. Loan Modifications Made to Borrowers Experiencing Financial Difficulty. The Company evaluates all restructurings, including restructurings for borrowers experiencing financial difficulty, to determine whether they result in a new loan or a continuation of an existing loan. In accordance with ASC Topic 326, “Financial Instruments—Credit Losses” , the Company only establishes a specific reserve for modifications to borrowers experiencing financial difficulty when the loan is identified as impaired. The effect of most modifications of loans made to borrowers who are experiencing financial difficulty is already included in the allowance for credit losses because of the measurement methodologies used to estimate the allowance. The Company adjusts the terms of loans for certain borrowers when it believes such changes will help its customers manage their loan obligations and increase the collectability of the loans. Modifications to borrowers experiencing financial difficulty may include but are not limited to changes in committed loan amount, interest rate, amortization, note maturity, borrower, guarantor, collateral, forbearance, forgiveness of principal or interest, and other actions intended to minimize economic loss and to avoid foreclosure or repossession of collateral. The approval of modifications of loans for borrowers experiencing financial difficulty are handled on a case-by-case basis. The following table displays the amortized cost of loans that were both experiencing financial difficulty and modified during the three months ended March 31, 2024 and 2023, presented by category of loan and type of modification. Term Extension Percentage of Total Loans Held for Investment (Dollars in thousands) Three Months Ended March 31, 2024 Commercial and industrial $ 413 — Agriculture 11,000 0.05 % Total $ 11,413 0.05 % Three Months Ended March 31, 2023 Construction, land development and other land loans $ 4,233 0.02 % Total $ 4,233 0.02 % The following table describes the modifications made to the loans presented above to borrowers experiencing financial difficulty for the three months ended March 31, 2024 and 2023. Term Extension Loan Type Three Months Ended March 31, 2024 Commercial and industrial Modified to a 7 year term Agriculture Modified to a 2 year term Loan Type Three Months Ended March 31, 2023 Construction, land development and other land loans Less than 12-month extension The Company did not have any modified loans that defaulted during the three months ende

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value	6. FAIR VALUE The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair values represent the estimated price that would be received from selling an asset or paid to transfer a liability, otherwise known as an “exit price.” Securities available for sale are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis. These nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or write-downs of individual assets. ASC Topic 820, “Fair Value Measurements and Disclosures” establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Fair Value Hierarchy The Company groups financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities) or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. The fair value disclosures below represent the Company’s estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding current economic conditions, risk characteristics of the various instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates. The following tables present fair values for assets and liabilities measured at fair value on a recurring basis: As of March 31, 2024 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Corporate debt securities $ — $ 15,845 $ — $ 15,845 Collateralized mortgage obligations — 194,806 — 194,806 Mortgage-backed securities — 104,649 — 104,649 Total $ — $ 315,300 $ — $ 315,300 Derivative financial instruments: Interest rate lock commitments $ — $ 256 $ — $ 256 Forward mortgage-backed securities trades — 8 — 8 Loan customer counterparty — — — — Financial institution counterparty — 4,309 — 4,309 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ — $ — $ — Forward mortgage-backed securities trades — 74 — 74 Loan customer counterparty — 4,330 — 4,330 Financial institution counterparty — — — — As of December 31, 2023 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Corporate debt securities $ — $ 21,787 $ — $ 21,787 Collateralized mortgage obligations — 320,044 — 320,044 Mortgage-backed securities — 96,757 — 96,757 Total available for sale securities $ — $ 438,588 $ — $ 438,588 Derivative financial instruments: Interest rate lock commitments $ — $ 218 $ — $ 218 Forward mortgage-backed securities trades — 1 — 1 Loan customer counterparty — — — — Financial institution counterparty — 3,876 — 3,876 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ — $ — $ — Forward mortgage-backed securities trades — 161 — 161 Loan customer counterparty — 3,899 — 3,899 Financial institution counterparty — — — — Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These instruments include other real estate owned, repossessed assets, held to maturity debt securities, loans held for sale and impaired loans, which are included as loans held for investment. For the three months ended March 31, 2024 , the Company had additions to other real estate owned of $ 969 thousand of which $ 845 thousand was outstanding as of March 31, 2024. For the three months ended March 31, 2024 , the Company had additions to impaired loans of $ 13.4 million, of which $ 13.4 million was outstanding as of March 31, 2024. The remaining financial assets and liabilities measured at fair value on a non-recurring basis that were recorded in 2024 and remained outstanding at March 31, 2024 were not significant. The following tables present carrying and fair value information of financial instruments as of the dates indicated: As of March 31, 2024 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 1,086,444 $ 1,086,444 $ — $ — $ 1,086,444 Federal funds sold 250 250 — — 250 Held to maturity securities 11,985,838 — 10,478,359 — 10,478,359 Loans held for sale 6,380 — 6,380 — 6,380 Loans held for investment, net of allowance 20,063,724 — — 18,465,513 18,465,513 Loans held for investment - Warehouse Purchase Program 864,924 — 864,924 — 864,924 Other real estate owned 2,204 — 2,204 — 2,204 Liabilities Deposits: Noninterest-bearing $ 9,526,535 $ — $ 9,526,535 $ — $ 9,526,535 Interest-bearing 17,648,983 — 17,611,669 — 17,611,669 Other borrowings 3,900,000 — 3,876,545 — 3,876,545 Securities sold under repurchase agreements 261,671 — 261,621 — 261,621 As of December 31, 2023 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 458,153 $ 458,153 $ — $ — $ 458,153 Federal funds sold 260 260 — — 260 Held to maturity securities 12,365,308 — 10,984,598 — 10,984,598 Loans held for sale 5,734 — 5,734 — 5,734 Loans held for investment, net of allowance 20,020,197 — — 18,321,054 18,321,054 Loans held for investment - Warehouse Purchase Program 822,245 — 822,245 — 822,245 Other real estate owned 1,708 — 1,708 — 1,708 Liabilities Deposits: Noninterest-bearing $ 9,776,572 $ — $ 9,776,572 $ — $ 9,776,572 Interest-bearing 17,403,237 — 17,371,523 — 17,371,523 Other borrowings 3,725,000 — 3,725,000 — 3,725,000 Securities sold under repurchase agreements 309,277 — 309,245 — 309,245 The following is a description of the fair value estimates, methods and assumptions that are used by the Company in estimating the fair values of financial instruments. Loans held for sale — Loans held for sale are carried at the lower of cost or estimated fair value. Fair value for consumer mortgages held for sale is based on commitments on hand from investors or prevailing market prices. As such, the Company classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2. Loans held for investment — The Company does not record loans at fair value on a recurring basis. As such, valuation techniques discussed herein for loans are primarily for estimating fair value disclosures. The Company’s discounted cash flow calculation to determine fair value considers internal and market-based information such as prepayment risk, cost of funds and liquidity. From time to time, the Company records nonrecurring fair value adjustments to impaired loans to reflect (1) partial write-downs that are based on the observable market price or current appraised value of the collateral, or (2) the full charge-off of the loan carrying value. Where appraisals are not available, estimated cash flows are discounted using a rate commensurate with the credit risk associated with those cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information. The Company classifies the estimated fair value of loans held for investment as Level 3. Other real estate owned — Other real estate owned is primarily foreclosed properties securing residential loans and commercial real estate loans. Foreclosed assets are adjusted to fair value less estimated costs to sell upon transfer of the loans to other real estate owned. Subsequently, these assets are carried at the lower of carrying value or fair value less estimated costs to sell. Other real estate carried at fair value based on an observable market price or a current appraised value is classified by the Company as Level 2. When management determines that the fair value of other real estate requires additional adjustments, either as a result of a non-current appraisal or when there is no observable market price, the Company classifies the other real estate as Level 3. The fair value estimates presented herein are based on information available to management at March 31, 2024 . Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

Goodwill and Core Deposit Intan

Goodwill and Core Deposit Intangibles	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	7. GOODWILL AND CORE DEPOSIT INTANGIBLES Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for the three months ended March 31, 2024 and the year ended December 31, 2023 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) Balance as of December 31, 2022 $ 3,231,636 $ 51,348 Less: Amortization — ( 12,676 ) Add: First Bancshares Merger 164,450 25,322 Balance as of December 31, 2023 3,396,086 63,994 Less: Amortization — ( 3,237 ) Add: First Bancshares Merger 316 — Balance as of March 31, 2024 $ 3,396,402 $ 60,757 Goodwill is recorded as of the acquisition date of each entity. The Company may record subsequent adjustments to goodwill for amounts undeterminable at acquisition date, such as deferred taxes and real estate valuations, and therefore the goodwill amounts may change accordingly. The Company initially records the total premium paid on acquisitions as goodwill. After finalizing the valuation, core deposit intangibles are identified and reclassified from goodwill to core deposit intangibles on the balance sheet. This reclassification has no effect on total assets, liabilities, shareholders’ equity, net income or cash flows. Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill or core deposit intangibles has occurred. If any such impairment is determined, a write-down is recorded. As of March 31, 2024 , there was no impairment recorded on goodwill and core deposit intangibles. The measurement period for the Company to determine the fair value of acquired identifiable assets and assumed liabilities will be at the end of the earlier of (1) twelve months from the date of acquisition or (2) as soon as the Company receives the information it was seeking about facts and circumstances that existed as of the date of acquisition. Core deposit intangibles are being amortized on a non-pro rata basis over their estimated lives, which the Company believes is between 10 and 15 years . Amortization expense related to intangible assets totaled $ 3.2 million and $ 2.4 million for the three months ended March 31, 2024 and 2023 , respectively. The estimated aggregate future amortization expense for core deposit intangibles remaining as of March 31, 2024 is as follows (dollars in thousands): Remaining 2024 $ 9,576 2025 11,409 2026 10,376 2027 9,288 2028 8,288 Thereafter 11,820 Total $ 60,757

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	8. STOCK–BASED COMPENSATION At March 31, 2024 , Bancshares had one active stock-based incentive compensation plan with awards outstanding. On March 3, 2020, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2020 Stock Incentive Plan (the “2020 Plan”), which was approved by Bancshares' shareholders on April 21, 2020. The 2020 Plan authorizes the issuance of up to 2,500,000 shares of common stock upon the exercise of options or pursuant to the grant or exercise, as the case may be, of other awards granted under the 2020 Plan, including incentive stock options, nonqualified stock options, stock appreciation rights, shares of restricted stock and restricted stock units. As of March 31, 2024 , 406,757 shares of restricted common stock have vested and 540,297 shares of unvested restricted stock have been issued under the 2020 Plan. As of March 31, 2024 , the Company had no stock options outstanding. Stock-based compensation expense related to restricted stock was $ 3.4 million and $ 3.2 million during the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024 , there was $ 28.0 million of total unrecognized compensation expense related to stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 1.95 years.

Contractual Obligations and Off

Contractual Obligations and Off-Balance Sheet Items	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligations and Off-Balance Sheet Items	9. CONTRACTUAL OBLIGATIONS AND OFF-BALANCE SHEET ITEMS Contractual Obligations The Company’s contractual obligations and other commitments to make future payments (other than deposit obligations and securities sold under repurchase agreements) as of March 31, 2024 are summarized below. The Company’s future cash payments associated with its contractual obligations pursuant to the Federal Reserve’s Bank Term Funding Program (“BTFP”) as of March 31, 2024 are summarized below. The future interest payments were calculated using the current rate in effect at March 31, 2024 . Payments under the BTFP include interest of $ 186.1 million that will be due over the future periods. These payments do not include prepayment options that may be available to the Company. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Bank Term Funding Program $ 4,086,149 $ — $ — $ — $ 4,086,149 Leases The Company’s leases relate primarily to operating leases for office space and banking centers. The Company determines if an arrangement is a lease or contains a lease at inception. The Company’s leases have remaining lease terms of 1 to 15 years , which may include the option to extend the lease when it is reasonably certain for the Company to exercise that option. Operating lease right-of-use (“ROU”) assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. The Company uses its incremental collateralized borrowing rate to determine the present value of lease payments. Short-term leases and leases with variable lease costs are immaterial and the Company has one sublease arrangement. Sublease income was $ 869 thousand and $ 806 thousand for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024 , operating lease ROU assets and lease liabilities were approximately $ 36.8 million. ROU assets and lease liabilities were classified as other assets and other liabilities, respectively. As of March 31, 2024 , the weighted average of remaining lease terms of the Company’s operating leases was 5.7 years. The weighted average discount rate used to determine the lease liabilities as of March 31, 2024 for the Company’s operating leases was 2.9 %. Cash paid for the Company’s operating leases was $ 2.9 million and $ 2.8 million for the three months ended March 31, 2024 and 2023, respectively. During the three months ended March 31, 2024 , the Company obtained $ 2.1 million in ROU assets in exchange for lease liabilities for one operating lease. The Company’s future undiscounted cash payments associated with its operating leases as of March 31, 2024 are summarized below (dollars in thousands). Remaining 2024 $ 7,877 2025 10,005 2026 8,865 2027 5,849 2028 2,873 2029 1,541 Thereafter 8,327 Total undiscounted lease payments $ 45,337 Off-Balance Sheet Items In the normal course of business, the Company enters into various transactions that, in accordance with GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company’s commitments associated with outstanding standby letters of credit, unused capacity on Warehouse Purchase Program loans and commitments to extend credit expiring by period as of March 31, 2024 are summarized below. Since commitments associated with letters of credit, unused capacity of Warehouse Purchase Program loans and commitments to extend credit may expire unused, the amounts shown may not necessarily reflect the actual future cash funding requirements. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Standby letters of credit $ 62,745 $ 18,559 $ 2,445 $ 26 $ 83,775 Unused capacity on Warehouse Purchase Program loans 1,058,576 — — — 1,058,576 Commitments to extend credit 1,489,941 1,020,761 296,869 1,623,299 4,430,870 Total $ 2,611,262 $ 1,039,320 $ 299,314 $ 1,623,325 $ 5,573,221 The Company records an allowance for credit losses on off-balance sheet credit exposure that is adjusted through a charge to provision for credit losses on the Company’s consolidated statement of income. At March 31, 2024 and December 31, 2023 , this allowance, reported as a separate line item on the Company’s consolidated balance sheet, totaled $ 36.5 million.

Other Comprehensive (Loss) Inco

Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Other Comprehensive (Loss) Income	10. OTHER COMPREHENSIVE (LOSS) INCOME The tax effects allocated to each component of other comprehensive (loss) income were as follows: Three Months Ended March 31, 2024 2023 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive loss: Securities available for sale: Change in unrealized loss during period $ ( 1,184 ) $ 249 $ ( 935 ) $ ( 4 ) $ 1 $ ( 3 ) Total securities available for sale ( 1,184 ) 249 ( 935 ) ( 4 ) 1 ( 3 ) Total other comprehensive loss $ ( 1,184 ) $ 249 $ ( 935 ) $ ( 4 ) $ 1 $ ( 3 ) Activity in accumulated other comprehensive loss associated with securities available for sale, net of tax, was as follows: Securities Available Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) Balance at December 31, 2023 $ ( 1,398 ) $ ( 1,398 ) Other comprehensive loss ( 935 ) ( 935 ) Balance at March 31, 2024 $ ( 2,333 ) $ ( 2,333 ) Balance at December 31, 2022 $ ( 3,473 ) $ ( 3,473 ) Other comprehensive loss ( 3 ) ( 3 ) Balance at March 31, 2023 $ ( 3,476 ) $ ( 3,476 )

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	11. DERIVATIVE FINANCIAL INSTRUMENTS The following table provides the outstanding notional balances and fair values of outstanding derivative positions at March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 Outstanding Asset Liability Derivative Outstanding Asset Liability Derivative (Dollars in thousands) Interest rate lock commitments $ 15,693 $ 256 $ — $ 7,113 $ 218 $ — Forward mortgage-backed securities trades 20,500 8 74 14,250 1 161 Commercial loan interest rate swaps and caps: Loan customer counterparty 67,207 — 4,330 67,408 — 3,899 Financial institution counterparty 67,207 4,309 — 67,408 3,876 — These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers’ financing needs. All derivatives are carried at fair value in either other assets or other liabilities, and all related cash flows are reported in the operating section of the consolidated statements of cash flows. Interest rate lock commitments (“IRLCs”) — In the normal course of business, the Company enters into interest rate lock commitments with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. Forward mortgage-backed securities trades — The Company manages the changes in fair value associated with changes in interest rates related to IRLCs by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the interest rate lock commitment is made. Interest rate swaps and caps — These derivative positions relate to transactions in which the Company enters into an interest rate swap or cap with a customer, while at the same time entering into an offsetting interest rate swap or cap with another financial institution. An interest rate swap transaction allows the Company’s customer to effectively convert a variable rate loan to a fixed rate. In connection with each swap, the Company agrees to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution a similar fixed interest rate on the same notional amount and receive substantially the same variable interest rate on the same notional amount. In connection with each interest rate cap, the Company sells a cap to the customer and agrees to pay interest if the underlying index exceeds the strike price defined in the cap agreement. Simultaneously the Company purchases a cap with matching terms from another financial institution that agrees to pay the Company if the underlying index exceeds the strike price. The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at March 31, 2024 and December 31, 2023 are presented in the following table. Weighted-Average Interest Rate March 31, 2024 December 31, 2023 Received Paid Received Paid Loan customer counterparty 3.07 % 6.78 % 3.07 % 6.81 % The Company’s credit exposure on interest rate swaps is limited to the net favorable value of all swaps by each counterparty, which was approximately $ 4.3 million at March 31, 2024 and $ 3.9 million at December 31, 2023 . This credit exposure is partly mitigated as transactions with customers are secured by the collateral, if any, securing the underlying transaction being hedged. The Company’s credit exposure, net of collateral pledged, relating to interest rate swaps with upstream financial institution counterparties was $ 280 thousand at March 31, 2024 . A credit support annex is in place and allows the Company to call collateral from upstream financial institution counterparties. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values. The Company’s cash collateral pledged for interest rate swaps was zero at March 31, 2024 and December 31, 2023. The initial and subsequent changes in the fair value of IRLCs and the forward sales of mortgage-backed securities are recorded in net gain on sale of mortgage loans. These gains and losses were not attributable to instrument-specific credit risk. For interest rate swaps and caps, because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on its results of operations. Income (loss) for the three months ended March 31, 2024 and 2023 was as follows: Three Months Ended March 31, Derivatives not designated as hedging instruments 2024 2023 (Dollars in thousands) Interest rate lock commitments $ 38 $ 30 Forward mortgage-backed securities trades 196 ( 50 )

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2024
Business Combinations [Abstract]
Acquisitions	12. ACQUISITIONS Merger of First Bancshares of Texas, Inc. — Effective May 1, 2023, the Company completed the Merger of First Bancshares of Texas, Inc. (“First Bancshares”) into Bancshares and the subsequent merger of its wholly owned subsidiary, FirstCapital Bank of Texas, N.A. (“FirstCapital Bank”), into the Bank. FirstCapital Bank operated 16 full-service banking offices in six different markets in West, North and Central Texas areas, including its main office in Midland, and banking offices in Midland, Lubbock, Amarillo, Wichita Falls, Burkburnett, Byers, Henrietta, Dallas, Horseshoe Bay, Marble Falls and Fredericksburg, Texas. As of March 31, 2023, First Bancshares, on a consolidated basis, reported total assets of $ 2.14 billion, total loans of $ 1.65 billion and total deposits of $ 1.71 billion. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included. Pursuant to the terms of the definitive agreement, Bancshares issued 3,583,370 shares of its common stock p lus approximately $ 91.5 million in cash for all outstanding shares of First Bancshares. As of March 31, 2024, the Company recognized goodwill of $ 164.8 million, w hich does not include all the subsequent fair value adjustments that have not yet been finalized. Goodwill represents the excess of the total purchase price paid over the fair value of the assets acquired, net of the fair value of liabilities assumed. During the second quarter of 2023, the Company completed the operational conversion of FirstCapital Bank.

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Event	13. SUBSEQUENT EVENT Merger of Lone Star State Bancshares, Inc. — Effective April 1, 2024, the Company completed the merger of Lone Star State Bancshares, Inc. (“Lone Star”) into Bancshares and the subsequent merger of its wholly owned subsidiary Lone Star State Bank of West Texas (“Lone Star Bank”), into the Bank. Lone Star operated five banking centers in the West Texas area, including its main office in Lubbock, and one banking center in each of Brownfield, Midland, Odessa and Big Spring, Texas. As of March 31, 2024, Lone Star, on a consolidated basis, reported total assets of $ 1.38 billion, total loans of $ 1.08 billion and total deposits of $ 1.24 billion. Under the terms of the definitive agreement, Bancshares issued 2,376,182 shares of its common stock plus approximately $ 64.1 million in cash for all outstanding shares of Lone Star in the second quarter of 2024.

New Accounting Standards (Polic

New Accounting Standards (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Standards Updates (''ASU'')	Accounting Standards Updates (“ASU”) ASU 2024-01, Compensation — Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards. ASU 2024-01 clarifies the scope application of profits interest and similar awards by adding illustrative guidance to help entities determine whether profits interest and similar awards should be accounted for as share-based payment arrangements within the scope of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 718 , “ Compensation — Stock Compensation .” However, this amendment does not change the intent of that guidance, nor how it should be applied. The ASU’s amendments are effective for fiscal years beginning after December 15, 2024, including interim periods within those years. The Company does not expect ASU 2024-01 to have a significant impact on its financial statements. ASU 2023-09, Income Taxes (Topic 740): Improvements to Income. ASU 2023-09 focuses on the rate reconciliation and income taxes paid and requires a public business entity to disclose, on an annual basis, a tabular rate reconciliation using both percentages and currency amounts, broken out into specified categories with certain reconciling items further broken out by nature and jurisdiction to the extent those items exceed a specified threshold. In addition, all entities are required to disclose income taxes paid, net of refunds received disaggregated by federal, state/local, and foreign and by jurisdiction if the amount is at least 5 % of total income tax payments, net of refunds received. For public business entities the new standard is effective for annual periods beginning after December 15, 2024, with early adoption permitted. An entity may apply the amendments in this ASU prospectively by providing the revised disclosures for the period ending December 31, 2025 and continuing to provide the pre-ASU disclosures for the prior periods, or may apply the amendments retrospectively by providing the revised disclosures for all period presented. The Company does not expect ASU 2023-09 to have an impact on its financial statements. ASU 2023-07, Segment Reporting (Topic 280)—Improvement to Reportable Segment Disclosures . ASU 2023-07 amends the disclosure requirements related to segment reporting primarily through enhanced disclosure about significant segment expenses and by requiring disclosure of segment information on an annual and interim basis. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company does not expect ASU 2023-07 to have a significant impact on its financial statements. ASU 2023-06, Disclosure Improvements—Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative. ASU 2023-06 amends the FASB Accounting Standards Codification to incorporate certain disclosure requirements from SEC Release No. 33-10532 - Disclosure Update and Simplification that was issued in 2018. The effective date for each amendment will be the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. The Company does not expect ASU 2023-06 to have a significant impact on its financial statements. ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The amendments in ASU 2022-02 eliminated the accounting guidance for troubled debt restructurings and enhanced disclosures for certain loan refinancing and restructurings to borrowers experiencing financial difficulty. This guidance was applied on a prospective basis. Additionally, ASU 2022-02 requires entities to disclose current-period gross charge-offs by year of origination. ASU 2022-02 became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s financial statements.

Income Per Common Share (Tables

Income Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table illustrates the computation of basic and diluted earnings per share: Three Months Ended March 31, 2024 2023 Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 110,426 $ 124,694 Basic: Weighted average shares outstanding 93,706 $ 1.18 91,207 $ 1.37 Diluted: Weighted average shares outstanding 93,706 $ 1.18 91,207 $ 1.37

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Investment Securities	The amortized cost and fair value of investment securities were as follows: March 31, 2024 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available for Sale Corporate debt securities $ 14,350 $ 1,830 $ ( 335 ) $ 15,845 Collateralized mortgage obligations 198,180 — ( 3,374 ) 194,806 Mortgage-backed securities 105,723 58 ( 1,132 ) 104,649 Total $ 318,253 $ 1,888 $ ( 4,841 ) $ 315,300 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,691 $ — $ ( 107 ) $ 7,584 States and political subdivisions 111,699 764 ( 2,581 ) 109,882 Corporate debt securities 12,000 — ( 3,840 ) 8,160 Collateralized mortgage obligations 256,216 — ( 25,076 ) 231,140 Mortgage-backed securities 11,598,232 388 ( 1,477,027 ) 10,121,593 Total $ 11,985,838 $ 1,152 $ ( 1,508,631 ) $ 10,478,359 December 31, 2023 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available for Sale Corporate debt securities $ 20,698 $ 1,827 $ ( 738 ) $ 21,787 Collateralized mortgage obligations 321,881 967 ( 2,804 ) 320,044 Mortgage-backed securities 97,779 96 ( 1,118 ) 96,757 Total $ 440,358 $ 2,890 $ ( 4,660 ) $ 438,588 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,631 $ — $ ( 52 ) $ 7,579 States and political subdivisions 116,497 1,864 ( 2,306 ) 116,055 Corporate debt securities 12,000 — ( 4,200 ) 7,800 Collateralized mortgage obligations 263,250 — ( 20,864 ) 242,386 Mortgage-backed securities 11,965,930 2,131 ( 1,357,283 ) 10,610,778 Total $ 12,365,308 $ 3,995 $ ( 1,384,705 ) $ 10,984,598
Securities in Continuous Loss Position	Securities with unrealized losses, segregated by length of time, that have been in a continuous loss position were as follows: March 31, 2024 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) Available for Sale Corporate debt securities $ 5,265 $ ( 335 ) $ — $ — $ 5,265 $ ( 335 ) Collateralized mortgage obligations 58,266 ( 874 ) 136,540 ( 2,500 ) 194,806 ( 3,374 ) Mortgage-backed securities 10,043 ( 60 ) 91,458 ( 1,072 ) 101,501 ( 1,132 ) Total $ 73,574 $ ( 1,269 ) $ 227,998 $ ( 3,572 ) $ 301,572 $ ( 4,841 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,583 $ ( 107 ) $ — $ — $ 7,583 $ ( 107 ) States and political subdivisions 14,877 ( 68 ) 54,906 ( 2,513 ) 69,783 ( 2,581 ) Corporate debt securities — — 8,160 ( 3,840 ) 8,160 ( 3,840 ) Collateralized mortgage obligations 47,876 ( 1,261 ) 183,228 ( 23,815 ) 231,104 ( 25,076 ) Mortgage-backed securities 147,256 ( 1,836 ) 9,900,482 ( 1,475,191 ) 10,047,738 ( 1,477,027 ) Total $ 217,592 $ ( 3,272 ) $ 10,146,776 $ ( 1,505,359 ) $ 10,364,368 $ ( 1,508,631 ) December 31, 2023 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) Available for Sale Corporate debt securities $ 7,300 $ ( 738 ) $ — $ — $ 7,300 $ ( 738 ) Collateralized mortgage obligations 54,611 ( 729 ) 114,758 ( 2,075 ) 169,369 ( 2,804 ) Mortgage-backed securities 1,154 ( 13 ) 92,211 ( 1,105 ) 93,365 ( 1,118 ) Total $ 63,065 $ ( 1,480 ) $ 206,969 $ ( 3,180 ) $ 270,034 $ ( 4,660 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,580 $ ( 52 ) $ — $ — $ 7,580 $ ( 52 ) States and political subdivisions 23,085 ( 79 ) 41,039 ( 2,227 ) 64,124 ( 2,306 ) Corporate debt securities — — 7,800 ( 4,200 ) 7,800 ( 4,200 ) Collateralized mortgage obligations 50,147 ( 470 ) 192,205 ( 20,394 ) 242,352 ( 20,864 ) Mortgage-backed securities 52,853 ( 807 ) 10,354,514 ( 1,356,476 ) 10,407,367 ( 1,357,283 ) Total $ 133,665 $ ( 1,408 ) $ 10,595,558 $ ( 1,383,297 ) $ 10,729,223 $ ( 1,384,705 )
Investment Securities by Contractual Maturity	The table below summarizes the amortized cost and fair value of investment securities at March 31, 2024, by contractual maturity. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations at any time with or without call or prepayment penalties. Held to Maturity Available for Sale Amortized Cost Fair Value Amortized Cost Fair Value (Dollars in thousands) Due in one year or less $ 27,214 $ 27,560 $ — $ — Due after one year through five years 45,853 45,608 — — Due after five years through ten years 46,427 41,573 14,350 15,845 Due after ten years 11,896 10,885 — — Subtotal 131,390 125,626 14,350 15,845 Mortgage-backed securities and collateralized mortgage obligations 11,854,448 10,352,733 303,903 299,455 Total $ 11,985,838 $ 10,478,359 $ 318,253 $ 315,300

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Types of Loans in Loan Portfolio	The loan portfolio consists of various types of loans and is categorized by major type as follows: March 31, 2024 December 31, 2023 (Dollars in thousands) Residential mortgage loans held for sale $ 6,380 $ 5,734 Commercial and industrial 2,470,848 2,305,040 Real estate: Construction, land development and other land loans 2,876,588 3,076,591 1-4 family residential (includes home equity) 8,275,040 8,162,344 Commercial real estate (includes multi-family residential) 5,631,460 5,662,948 Farmland 590,896 598,898 Agriculture 222,196 217,145 Consumer and other 326,915 329,593 Total loans held for investment, excluding Warehouse Purchase Program 20,393,943 20,352,559 Warehouse Purchase Program 864,924 822,245 Total loans, including Warehouse Purchase Program $ 21,265,247 $ 21,180,538
Related Party Loans	An analysis of activity with respect to these related party loans is as follows: As of and for the As of and for the 31, 2023 (Dollars in thousands) Beginning balance on January 1 $ 292 $ 547 New loans 1 64 Repayments ( 3 ) ( 319 ) Ending balance $ 290 $ 292
Aging Analysis of Past Due Loans	An aging analysis of past due loans, segregated by category of loan, is presented below: March 31, 2024 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans Total Loans (Dollars in thousands) Construction, land development and other land loans $ 17,078 $ — $ 17,078 $ 14,749 $ 2,844,761 $ 2,876,588 Warehouse Purchase Program loans — — — — 864,924 864,924 Agriculture and agriculture real estate (includes farmland) 3,672 428 4,100 3,286 805,706 813,092 1-4 family (includes home equity) (1) 37,462 — 37,462 29,464 8,214,494 8,281,420 Commercial real estate (includes multi-family residential) 13,036 2,417 15,453 21,303 5,594,704 5,631,460 Commercial and industrial 20,715 190 20,905 9,542 2,440,401 2,470,848 Consumer and other 432 — 432 131 326,352 326,915 Total $ 92,395 $ 3,035 $ 95,430 $ 78,475 $ 21,091,342 $ 21,265,247 December 31, 2023 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans Total Loans (Dollars in thousands) Construction, land development and other land loans $ 21,627 $ 1,635 $ 23,262 $ 14,770 $ 3,038,559 $ 3,076,591 Warehouse Purchase Program loans — — — — 822,245 822,245 Agriculture and agriculture real estate (includes farmland) 8,572 — 8,572 1,460 806,011 816,043 1-4 family (includes home equity) (1) 38,350 130 38,480 25,694 8,103,904 8,168,078 Commercial real estate (includes multi-family residential) 23,511 — 23,511 18,662 5,620,775 5,662,948 Commercial and industrial 14,782 430 15,212 8,066 2,281,762 2,305,040 Consumer and other 503 — 503 36 329,054 329,593 Total $ 107,345 $ 2,195 $ 109,540 $ 68,688 $ 21,002,310 $ 21,180,538 (1) Includes $ 6.4 million and $ 5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023 , respectively.
Non-performing Assets	The following table presents information regarding nonperforming assets as of the dates indicated: March 31, 2024 December 31, 2023 (Dollars in thousands) Nonaccrual loans (1) (2) $ 78,475 $ 68,688 Accruing loans 90 or more days past due 3,035 2,195 Total nonperforming loans 81,510 70,883 Repossessed assets 97 76 Other real estate 2,204 1,708 Total nonperforming assets $ 83,811 $ 72,667 Nonperforming assets to total loans and other real estate 0.39 % 0.34 % Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.41 % 0.36 % Nonaccrual loans to total loans 0.37 % 0.32 % Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.38 % 0.34 % (1) ASU 2022-02 became effective for the Company on January 1, 2023. (2) There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.
Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans	The recorded investment in PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 (Dollars in thousands) PCD loans: Outstanding balance $ 495,074 $ 533,653 Discount ( 7,361 ) ( 7,914 ) Recorded investment $ 487,713 $ 525,739 The recorded investment in Non-PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 (Dollars in thousands) Non-PCD loans: Outstanding balance $ 1,676,563 $ 1,823,809 Discount ( 18,681 ) ( 19,992 ) Recorded investment $ 1,657,882 $ 1,803,817
Summary of Changes in Accretable Yields of Acquired Loans	Changes in the accretable yield for acquired PCD loans for the three months ended March 31, 2024 and 2023 were as follows: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ 7,914 $ 3,361 Accretion charge-offs ( 5 ) — Accretion ( 548 ) ( 339 ) Balance at March 31, $ 7,361 $ 3,022 Changes in the discount accretion for Non-PCD loans for the three months ended March 31, 2024 and 2023 were as follows: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ 19,992 $ 2,233 Accretion recoveries 1 — Accretion ( 1,312 ) ( 532 ) Balance at March 31, $ 18,681 $ 1,701
Risk Grade by Category of Loan and Year of Origination/Renewal	The following tables present loans by risk grade, by category of loan and year of origination/renewal at March 31, 2024. Term Loans Amortized Cost Basis by Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Construction, Land Development and Other Land Loans Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — 1,106 166 — — 14 — — 1,286 Grade 3 103,359 745,828 696,969 364,477 215,354 57,308 119,072 — 2,302,367 Grade 4 3,478 83,562 146,216 42,544 5,572 26,944 30,782 — 339,098 Grade 5 — — 1,357 — 23,373 15,796 769 — 41,295 Grade 6 — 570 — 7,698 184 561 — — 9,013 Grade 7 — 183 2,647 343 — 242 248 — 3,663 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 1,218 29,616 98,450 15,171 7,649 7,371 20,391 — 179,866 Total $ 108,055 $ 860,865 $ 945,805 $ 430,233 $ 252,132 $ 108,236 $ 171,262 $ — $ 2,876,588 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Agriculture and Agriculture Real Estate (includes Farmland) Grade 1 $ 720 $ 1,179 $ 1,231 $ 172 $ 252 $ 369 $ 8,590 $ — $ 12,513 Grade 2 — 13 60 101 — 722 46 — 942 Grade 3 20,051 126,212 168,180 76,630 47,924 118,858 102,641 94 660,590 Grade 4 3,436 21,435 19,644 25,993 4,122 9,589 21,807 — 106,026 Grade 5 725 57 799 885 — 1,143 — — 3,609 Grade 6 — — — 78 — 1,195 — — 1,273 Grade 7 — — 1,469 558 339 29 — — 2,395 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 1,986 2,532 1,345 14,558 2,630 2,693 — 25,744 Total $ 24,932 $ 150,882 $ 193,915 $ 105,762 $ 67,195 $ 134,535 $ 135,777 $ 94 $ 813,092 Current-period gross write-offs $ — $ — $ — $ — $ — $ 121 $ — $ — $ 121 1-4 Family (includes Home Equity) (1) Grade 1 $ — $ 74 $ 153 $ — $ 109 $ — $ — $ — $ 336 Grade 2 — 526 1,243 153 236 2,602 — — 4,760 Grade 3 109,256 1,172,870 2,253,123 2,140,728 1,021,887 1,310,779 91,597 2,757 8,102,997 Grade 4 1,178 15,265 15,813 25,722 5,681 64,138 2,871 204 130,872 Grade 5 — — 1,206 — 119 2,517 — — 3,842 Grade 6 — — 357 41 19 1,840 — — 2,257 Grade 7 — 1,744 7,554 5,304 4,433 9,293 95 — 28,423 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 625 4,243 475 469 2,121 — — 7,933 Total $ 110,434 $ 1,191,104 $ 2,283,692 $ 2,172,423 $ 1,032,953 $ 1,393,290 $ 94,563 $ 2,961 $ 8,281,420 Current-period gross write-offs $ — $ — $ 389 $ — $ 33 $ 39 $ — $ — $ 461 Term Loans Amortized Cost Basis by Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Commercial Real Estate (includes Multi-Family Residential) Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — 1,128 — 459 2,232 — — 3,819 Grade 3 50,492 403,245 908,841 680,193 405,589 1,246,771 77,627 4,591 3,777,349 Grade 4 2,667 43,104 262,140 172,287 217,796 716,336 15,857 — 1,430,187 Grade 5 — 192 2,538 4,771 — 89,422 2,355 — 99,278 Grade 6 — — — 356 11,451 76,088 — — 87,895 Grade 7 — 1,693 827 2,464 — 806 — — 5,790 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 540 13,613 53,166 49,281 38,547 71,666 329 — 227,142 Total $ 53,699 $ 461,847 $ 1,228,640 $ 909,352 $ 673,842 $ 2,203,321 $ 96,168 $ 4,591 $ 5,631,460 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Commercial and Industrial Grade 1 $ 6,392 $ 15,267 $ 9,372 $ 6,418 $ 2,811 $ 6,188 $ 41,360 $ 176 $ 87,984 Grade 2 — 695 7,799 219 195 3,651 2,295 — 14,854 Grade 3 211,874 206,299 222,945 147,665 49,661 187,230 910,134 30,276 1,966,084 Grade 4 20,633 44,614 30,936 14,641 11,286 110,319 65,063 2,222 299,714 Grade 5 — 17 21,827 6,057 1,666 788 8,200 100 38,655 Grade 6 413 311 3,898 615 354 962 2,390 — 8,943 Grade 7 — 3,900 420 195 1,268 1,416 457 — 7,656 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 3,689 14,070 3,637 661 2,439 22,462 — 46,958 Total $ 239,312 $ 274,792 $ 311,267 $ 179,447 $ 67,902 $ 312,993 $ 1,052,361 $ 32,774 $ 2,470,848 Current-period gross write-offs $ — $ 53 $ 349 $ 39 $ — $ 24 $ 895 $ — $ 1,360 Consumer and Other Grade 1 $ 4,614 $ 12,520 $ 5,465 $ 2,813 $ 1,681 $ 5,914 $ 2,588 $ — $ 35,595 Grade 2 6,132 12,406 14,181 — — 1,839 1,507 — 36,065 Grade 3 24,054 40,317 38,129 24,769 11,901 17,352 75,004 11 231,537 Grade 4 — 1,748 257 1,105 15,259 2,255 2,865 — 23,489 Grade 5 — — — — — — — — — Grade 6 — — 31 5 — — — — 36 Grade 7 — — — — 122 1 — — 123 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — 34 7 15 14 — 70 Total $ 34,800 $ 66,991 $ 58,063 $ 28,726 $ 28,970 $ 27,376 $ 81,978 $ 11 $ 326,915 Current-period gross write-offs $ 1,470 $ 20 $ 17 $ 24 $ — $ 70 $ 58 $ — $ 1,659 Term Loans Amortized Cost Basis by Origination Year 2024 2023 2022 2021 2020 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Warehouse Purchase Program Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — — — — — — — — Grade 3 864,924 — — — — — — — 864,924 Grade 4 — — — — — — — — — Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 864,924 $ — $ — $ — $ — $ — $ — $ — $ 864,924 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Total Grade 1 $ 11,726 $ 29,040 $ 16,221 $ 9,403 $ 4,853 $ 12,471 $ 52,538 $ 176 $ 136,428 Grade 2 6,132 14,746 24,577 473 890 11,060 3,848 — 61,726 Grade 3 1,384,010 2,694,771 4,288,187 3,434,462 1,752,316 2,938,298 1,376,075 37,729 17,905,848 Grade 4 31,392 209,728 475,006 282,292 259,716 929,581 139,245 2,426 2,329,386 Grade 5 725 266 27,727 11,713 25,158 109,666 11,324 100 186,679 Grade 6 413 881 4,286 8,793 12,008 80,646 2,390 — 109,417 Grade 7 — 7,520 12,917 8,864 6,162 11,787 800 — 48,050 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 1,758 49,529 172,461 69,943 61,891 86,242 45,889 — 487,713 Total $ 1,436,156 $ 3,006,481 $ 5,021,382 $ 3,825,943 $ 2,122,994 $ 4,179,751 $ 1,632,109 $ 40,431 $ 21,265,247 Current-period gross write-offs $ 1,470 $ 73 $ 755 $ 63 $ 33 $ 254 $ 953 $ — $ 3,601 (1) Includes $ 6.4 million of residential mortgage loans held for sale at March 31, 2024 .
Allowance for Credit Losses on Loans by Category of Loan	The following table details activity in the allowance for credit losses on loans by category of loan for the three months ended March 31, 2024 and 2023. Construction, Land Development and Other Land Loans Agriculture and Agriculture Real Estate (includes Farmland) 1-4 Family (includes Home Equity) Commercial Real Estate (includes Multi-Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Allowance for credit losses on loans: Three Months Ended Balance December 31, 2023 $ 87,775 $ 11,380 $ 77,652 $ 88,664 $ 59,832 $ 7,059 $ 332,362 Provision for credit losses on loans ( 5,619 ) 1,270 2,469 ( 1,468 ) 2,067 1,281 — Charge-offs — ( 121 ) ( 461 ) — ( 1,360 ) ( 1,659 ) ( 3,601 ) Recoveries 2 98 4 17 1,077 260 1,458 Net (charge-offs) recoveries 2 ( 23 ) ( 457 ) 17 ( 283 ) ( 1,399 ) ( 2,143 ) Balance March 31, 2024 $ 82,158 $ 12,627 $ 79,664 $ 87,213 $ 61,616 $ 6,941 $ 330,219 Allowance for credit losses on loans: Three Months Ended Balance December 31, 2022 $ 78,853 $ 7,699 $ 60,795 $ 66,272 $ 62,319 $ 5,638 $ 281,576 Provision for credit losses 1,695 356 1,603 1,699 ( 6,495 ) 1,142 — Charge-offs — — ( 65 ) — ( 901 ) ( 1,225 ) ( 2,191 ) Recoveries 13 6 205 1 2,373 208 2,806 Net (charge-offs) recoveries 13 6 140 1 1,472 ( 1,017 ) 615 Balance March 31, 2023 $ 80,561 $ 8,061 $ 62,538 $ 67,972 $ 57,296 $ 5,763 $ 282,191
Schedule of Amortized Cost of Loans Experiencing Financial Difficulty and Modified	The following table displays the amortized cost of loans that were both experiencing financial difficulty and modified during the three months ended March 31, 2024 and 2023, presented by category of loan and type of modification. Term Extension Percentage of Total Loans Held for Investment (Dollars in thousands) Three Months Ended March 31, 2024 Commercial and industrial $ 413 — Agriculture 11,000 0.05 % Total $ 11,413 0.05 % Three Months Ended March 31, 2023 Construction, land development and other land loans $ 4,233 0.02 % Total $ 4,233 0.02 %
Schedule of Loan Modifications	The following table describes the modifications made to the loans presented above to borrowers experiencing financial difficulty for the three months ended March 31, 2024 and 2023. Term Extension Loan Type Three Months Ended March 31, 2024 Commercial and industrial Modified to a 7 year term Agriculture Modified to a 2 year term Loan Type Three Months Ended March 31, 2023 Construction, land development and other land loans Less than 12-month extension

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Assets and Liabilities Measured on Recurring Basis	The following tables present fair values for assets and liabilities measured at fair value on a recurring basis: As of March 31, 2024 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Corporate debt securities $ — $ 15,845 $ — $ 15,845 Collateralized mortgage obligations — 194,806 — 194,806 Mortgage-backed securities — 104,649 — 104,649 Total $ — $ 315,300 $ — $ 315,300 Derivative financial instruments: Interest rate lock commitments $ — $ 256 $ — $ 256 Forward mortgage-backed securities trades — 8 — 8 Loan customer counterparty — — — — Financial institution counterparty — 4,309 — 4,309 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ — $ — $ — Forward mortgage-backed securities trades — 74 — 74 Loan customer counterparty — 4,330 — 4,330 Financial institution counterparty — — — — As of December 31, 2023 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Corporate debt securities $ — $ 21,787 $ — $ 21,787 Collateralized mortgage obligations — 320,044 — 320,044 Mortgage-backed securities — 96,757 — 96,757 Total available for sale securities $ — $ 438,588 $ — $ 438,588 Derivative financial instruments: Interest rate lock commitments $ — $ 218 $ — $ 218 Forward mortgage-backed securities trades — 1 — 1 Loan customer counterparty — — — — Financial institution counterparty — 3,876 — 3,876 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ — $ — $ — Forward mortgage-backed securities trades — 161 — 161 Loan customer counterparty — 3,899 — 3,899 Financial institution counterparty — — — —
Summary of Carrying and Fair Value Information of Financial Instruments	The following tables present carrying and fair value information of financial instruments as of the dates indicated: As of March 31, 2024 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 1,086,444 $ 1,086,444 $ — $ — $ 1,086,444 Federal funds sold 250 250 — — 250 Held to maturity securities 11,985,838 — 10,478,359 — 10,478,359 Loans held for sale 6,380 — 6,380 — 6,380 Loans held for investment, net of allowance 20,063,724 — — 18,465,513 18,465,513 Loans held for investment - Warehouse Purchase Program 864,924 — 864,924 — 864,924 Other real estate owned 2,204 — 2,204 — 2,204 Liabilities Deposits: Noninterest-bearing $ 9,526,535 $ — $ 9,526,535 $ — $ 9,526,535 Interest-bearing 17,648,983 — 17,611,669 — 17,611,669 Other borrowings 3,900,000 — 3,876,545 — 3,876,545 Securities sold under repurchase agreements 261,671 — 261,621 — 261,621 As of December 31, 2023 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 458,153 $ 458,153 $ — $ — $ 458,153 Federal funds sold 260 260 — — 260 Held to maturity securities 12,365,308 — 10,984,598 — 10,984,598 Loans held for sale 5,734 — 5,734 — 5,734 Loans held for investment, net of allowance 20,020,197 — — 18,321,054 18,321,054 Loans held for investment - Warehouse Purchase Program 822,245 — 822,245 — 822,245 Other real estate owned 1,708 — 1,708 — 1,708 Liabilities Deposits: Noninterest-bearing $ 9,776,572 $ — $ 9,776,572 $ — $ 9,776,572 Interest-bearing 17,403,237 — 17,371,523 — 17,371,523 Other borrowings 3,725,000 — 3,725,000 — 3,725,000 Securities sold under repurchase agreements 309,277 — 309,245 — 309,245

Goodwill and Core Deposit Int_2

Goodwill and Core Deposit Intangibles (Tables)	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for the three months ended March 31, 2024 and the year ended December 31, 2023 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) Balance as of December 31, 2022 $ 3,231,636 $ 51,348 Less: Amortization — ( 12,676 ) Add: First Bancshares Merger 164,450 25,322 Balance as of December 31, 2023 3,396,086 63,994 Less: Amortization — ( 3,237 ) Add: First Bancshares Merger 316 — Balance as of March 31, 2024 $ 3,396,402 $ 60,757
Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles	The estimated aggregate future amortization expense for core deposit intangibles remaining as of March 31, 2024 is as follows (dollars in thousands): Remaining 2024 $ 9,576 2025 11,409 2026 10,376 2027 9,288 2028 8,288 Thereafter 11,820 Total $ 60,757

Contractual Obligations and O_2

Contractual Obligations and Off-Balance Sheet Items (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances	The Company’s future cash payments associated with its contractual obligations pursuant to the Federal Reserve’s Bank Term Funding Program (“BTFP”) as of March 31, 2024 are summarized below. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Bank Term Funding Program $ 4,086,149 $ — $ — $ — $ 4,086,149
Future Undiscounted Cash Payments Associated with its Operating Leases	The Company’s future undiscounted cash payments associated with its operating leases as of March 31, 2024 are summarized below (dollars in thousands). Remaining 2024 $ 7,877 2025 10,005 2026 8,865 2027 5,849 2028 2,873 2029 1,541 Thereafter 8,327 Total undiscounted lease payments $ 45,337
Summary of Commitments Associated with Outstanding Standby Letters of Credit, Unused Capacity on Warehouse Purchase Program Loans and Commitments to Extend Credit	The Company’s commitments associated with outstanding standby letters of credit, unused capacity on Warehouse Purchase Program loans and commitments to extend credit expiring by period as of March 31, 2024 are summarized below. Since commitments associated with letters of credit, unused capacity of Warehouse Purchase Program loans and commitments to extend credit may expire unused, the amounts shown may not necessarily reflect the actual future cash funding requirements. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Standby letters of credit $ 62,745 $ 18,559 $ 2,445 $ 26 $ 83,775 Unused capacity on Warehouse Purchase Program loans 1,058,576 — — — 1,058,576 Commitments to extend credit 1,489,941 1,020,761 296,869 1,623,299 4,430,870 Total $ 2,611,262 $ 1,039,320 $ 299,314 $ 1,623,325 $ 5,573,221

Other Comprehensive (Loss) In_2

Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Tax Effects Allocated to Each Component of Other Comprehensive (Loss) Income	The tax effects allocated to each component of other comprehensive (loss) income were as follows: Three Months Ended March 31, 2024 2023 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive loss: Securities available for sale: Change in unrealized loss during period $ ( 1,184 ) $ 249 $ ( 935 ) $ ( 4 ) $ 1 $ ( 3 ) Total securities available for sale ( 1,184 ) 249 ( 935 ) ( 4 ) 1 ( 3 ) Total other comprehensive loss $ ( 1,184 ) $ 249 $ ( 935 ) $ ( 4 ) $ 1 $ ( 3 )
Activity in Accumulated Other Comprehensive Loss Associated with Securities Available for Sale, Net of Tax	Activity in accumulated other comprehensive loss associated with securities available for sale, net of tax, was as follows: Securities Available Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) Balance at December 31, 2023 $ ( 1,398 ) $ ( 1,398 ) Other comprehensive loss ( 935 ) ( 935 ) Balance at March 31, 2024 $ ( 2,333 ) $ ( 2,333 ) Balance at December 31, 2022 $ ( 3,473 ) $ ( 3,473 ) Other comprehensive loss ( 3 ) ( 3 ) Balance at March 31, 2023 $ ( 3,476 ) $ ( 3,476 )

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Balances and Fair Value of Derivative Positions	The following table provides the outstanding notional balances and fair values of outstanding derivative positions at March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 Outstanding Asset Liability Derivative Outstanding Asset Liability Derivative (Dollars in thousands) Interest rate lock commitments $ 15,693 $ 256 $ — $ 7,113 $ 218 $ — Forward mortgage-backed securities trades 20,500 8 74 14,250 1 161 Commercial loan interest rate swaps and caps: Loan customer counterparty 67,207 — 4,330 67,408 — 3,899 Financial institution counterparty 67,207 4,309 — 67,408 3,876 —
Schedule of Weighted Average Received and Paid Interest Rates for Interest Rate Swaps Outstanding	The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at March 31, 2024 and December 31, 2023 are presented in the following table. Weighted-Average Interest Rate March 31, 2024 December 31, 2023 Received Paid Received Paid Loan customer counterparty 3.07 % 6.78 % 3.07 % 6.81 %
Schedule of Income (Loss) from Derivatives Not Designated as Hedging Instruments	Income (loss) for the three months ended March 31, 2024 and 2023 was as follows: Three Months Ended March 31, Derivatives not designated as hedging instruments 2024 2023 (Dollars in thousands) Interest rate lock commitments $ 38 $ 30 Forward mortgage-backed securities trades 196 ( 50 )

Income Per Common Share - Sched

Income Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 110,426	$ 124,694
Basic, Weighted average shares outstanding (in shares)	93,706	91,207
Basic	$ 1.18	$ 1.37
Diluted, Weighted average shares outstanding (in shares)	93,706	91,207
Diluted	$ 1.18	$ 1.37

Income Per Common Share - Addit

Income Per Common Share - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Number of options outstanding	0
Antidilutive Securities excluded from computation of earnings per share, amount	0	0

New Accounting Standards - Addi

New Accounting Standards - Additional Information (Details)	Mar. 31, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
Minimum percentage of income tax payment net of refunds received	5%

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	$ 318,253	$ 440,358
Available for Sale, Gross Unrealized Gains	1,888	2,890
Available for Sale, Gross Unrealized Losses	(4,841)	(4,660)
Available for Sale	315,300	438,588
Held to Maturity, Amortized Cost	11,985,838	12,365,308
Held to Maturity, Gross Unrealized Gains	1,152	3,995
Held to Maturity, Gross Unrealized Losses	(1,508,631)	(1,384,705)
Held to Maturity	10,478,359	10,984,598	$ 10,984,598
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	14,350	20,698
Available for Sale, Gross Unrealized Gains	1,830	1,827
Available for Sale, Gross Unrealized Losses	(335)	(738)
Available for Sale	15,845	21,787
Held to Maturity, Amortized Cost	12,000	12,000
Held to Maturity, Gross Unrealized Losses	(3,840)	(4,200)
Held to Maturity	8,160	7,800
Collateralized Mortgage Obligations [Member]
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	198,180	321,881
Available for Sale, Gross Unrealized Gains		967
Available for Sale, Gross Unrealized Losses	(3,374)	(2,804)
Available for Sale	194,806	320,044
Held to Maturity, Amortized Cost	256,216	263,250
Held to Maturity, Gross Unrealized Losses	(25,076)	(20,864)
Held to Maturity	231,140	242,386
Mortgage-backed Securities [Member]
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	105,723	97,779
Available for Sale, Gross Unrealized Gains	58	96
Available for Sale, Gross Unrealized Losses	(1,132)	(1,118)
Available for Sale	104,649	96,757
Held to Maturity, Amortized Cost	11,598,232	11,965,930
Held to Maturity, Gross Unrealized Gains	388	2,131
Held to Maturity, Gross Unrealized Losses	(1,477,027)	(1,357,283)
Held to Maturity	10,121,593	10,610,778
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Marketable Securities [Line Items]
Held to Maturity, Amortized Cost	7,691	7,631
Held to Maturity, Gross Unrealized Losses	(107)	(52)
Held to Maturity	7,584	7,579
States and Political Subdivisions [Member]
Marketable Securities [Line Items]
Held to Maturity, Amortized Cost	111,699	116,497
Held to Maturity, Gross Unrealized Gains	764	1,864
Held to Maturity, Gross Unrealized Losses	(2,581)	(2,306)
Held to Maturity	$ 109,882	$ 116,055

Securities - Additional Informa

Securities - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) Segment Security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) Security
Schedule Of Held To Maturity Securities [Line Items]
Number of Investment Securities Segments | Segment	2
Credit losses	$ 0
Municipal securities percentage of securities portfolio	0.90%
Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year | Security	1,028		941
Gain (loss) on sale of securities	$ 298,000	$ 0
Available for Sale Securities, Amortized Cost Basis	318,253,000		$ 440,358,000
Debt Securities, Available-for-Sale	315,300,000		438,588,000
Collateralized Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Available for Sale Securities, Amortized Cost Basis	10,990,000,000		11,340,000,000
Debt Securities, Available-for-Sale	$ 9,600,000,000		$ 10,090,000,000
Securities Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Other Than U.S. Government and Agencies [Member]
Schedule Of Held To Maturity Securities [Line Items]
Concentration Risk, Percentage	10%		10%

Securities - Securities in Cont

Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	$ 73,574	$ 63,065
Available for Sale, Unrealized Losses, Less than 12 Months	(1,269)	(1,480)
Available for Sale, Estimated Fair Value, 12 Months or More	227,998	206,969
Available for Sale, Unrealized Losses, 12 Months or More	(3,572)	(3,180)
Available for Sale, Estimated Fair Value, Total	301,572	270,034
Available for Sale, Unrealized Losses, Total	(4,841)	(4,660)
Held to Maturity, Estimated Fair Value, Less than 12 Months	217,592	133,665
Held to Maturity, Unrealized Losses, Less than 12 Months	(3,272)	(1,408)
Held to Maturity, Estimated Fair Value, 12 Months or More	10,146,776	10,595,558
Held to Maturity, Unrealized Losses, 12 Months or More	(1,505,359)	(1,383,297)
Held to Maturity, Estimated Fair Value, Total	10,364,368	10,729,223
Held to Maturity, Unrealized Losses, Total	(1,508,631)	(1,384,705)
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	5,265	7,300
Available for Sale, Unrealized Losses, Less than 12 Months	(335)	(738)
Available for Sale, Estimated Fair Value, Total	5,265	7,300
Available for Sale, Unrealized Losses, Total	(335)	(738)
Held to Maturity, Estimated Fair Value, 12 Months or More	8,160	7,800
Held to Maturity, Unrealized Losses, 12 Months or More	(3,840)	(4,200)
Held to Maturity, Estimated Fair Value, Total	8,160	7,800
Held to Maturity, Unrealized Losses, Total	(3,840)	(4,200)
Collateralized Mortgage Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	58,266	54,611
Available for Sale, Unrealized Losses, Less than 12 Months	(874)	(729)
Available for Sale, Estimated Fair Value, 12 Months or More	136,540	114,758
Available for Sale, Unrealized Losses, 12 Months or More	(2,500)	(2,075)
Available for Sale, Estimated Fair Value, Total	194,806	169,369
Available for Sale, Unrealized Losses, Total	(3,374)	(2,804)
Held to Maturity, Estimated Fair Value, Less than 12 Months	47,876	50,147
Held to Maturity, Unrealized Losses, Less than 12 Months	(1,261)	(470)
Held to Maturity, Estimated Fair Value, 12 Months or More	183,228	192,205
Held to Maturity, Unrealized Losses, 12 Months or More	(23,815)	(20,394)
Held to Maturity, Estimated Fair Value, Total	231,104	242,352
Held to Maturity, Unrealized Losses, Total	(25,076)	(20,864)
Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	10,043	1,154
Available for Sale, Unrealized Losses, Less than 12 Months	(60)	(13)
Available for Sale, Estimated Fair Value, 12 Months or More	91,458	92,211
Available for Sale, Unrealized Losses, 12 Months or More	(1,072)	(1,105)
Available for Sale, Estimated Fair Value, Total	101,501	93,365
Available for Sale, Unrealized Losses, Total	(1,132)	(1,118)
Held to Maturity, Estimated Fair Value, Less than 12 Months	147,256	52,853
Held to Maturity, Unrealized Losses, Less than 12 Months	(1,836)	(807)
Held to Maturity, Estimated Fair Value, 12 Months or More	9,900,482	10,354,514
Held to Maturity, Unrealized Losses, 12 Months or More	(1,475,191)	(1,356,476)
Held to Maturity, Estimated Fair Value, Total	10,047,738	10,407,367
Held to Maturity, Unrealized Losses, Total	(1,477,027)	(1,357,283)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Estimated Fair Value, Less than 12 Months	7,583	7,580
Held to Maturity, Unrealized Losses, Less than 12 Months	(107)	(52)
Held to Maturity, Estimated Fair Value, Total	7,583	7,580
Held to Maturity, Unrealized Losses, Total	(107)	(52)
States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Estimated Fair Value, Less than 12 Months	14,877	23,085
Held to Maturity, Unrealized Losses, Less than 12 Months	(68)	(79)
Held to Maturity, Estimated Fair Value, 12 Months or More	54,906	41,039
Held to Maturity, Unrealized Losses, 12 Months or More	(2,513)	(2,227)
Held to Maturity, Estimated Fair Value, Total	69,783	64,124
Held to Maturity, Unrealized Losses, Total	$ (2,581)	$ (2,306)

Securities - Investment Securit

Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 27,214
Held to Maturity, amortized cost, due after one year through five years	45,853
Held to Maturity, amortized cost, due after five years through ten years	46,427
Held to Maturity, amortized cost, due after ten years	11,896
Held to Maturity, amortized cost, subtotal	131,390
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	11,854,448
Held to Maturity, Amortized Cost	11,985,838	$ 12,365,308
Held to Maturity, fair value, due in one year or less	27,560
Held to Maturity, fair value, due after one year through five years	45,608
Held to Maturity, fair value, due after five years through ten years	41,573
Held to Maturity, fair value, due after ten years	10,885
Held to Maturity, fair value, subtotal	125,626
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	10,352,733
Held to Maturity, fair value, total	10,478,359	10,984,598	$ 10,984,598
Available for Sale, amortized cost, due after five years through ten years	14,350
Available for Sale, amortized cost, subtotal	14,350
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations	303,903
Available for Sale, Amortized Cost	318,253	440,358
Available for Sale, fair value, due after five years through ten years	15,845
Available for Sale, fair value, subtotal	15,845
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	299,455
Available for Sale securities, at fair value	$ 315,300	$ 438,588

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Types of Loans in Loan Portfolio (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		$ 6,380	$ 5,734
Loans held for investment		20,393,943	20,352,559
Total loans, including Warehouse Purchase Program		21,265,247	21,180,538
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		6,380	5,734
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		864,924	822,245
Total loans, including Warehouse Purchase Program		864,924	822,245
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,470,848	2,305,040
Total loans, including Warehouse Purchase Program		2,470,848	2,305,040
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,876,588	3,076,591
Total loans, including Warehouse Purchase Program		2,876,588	3,076,591
Real Estate [Member] | 1-4 Family [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		8,275,040	8,162,344
Total loans, including Warehouse Purchase Program	[1]	8,281,420	8,168,078
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		5,631,460	5,662,948
Total loans, including Warehouse Purchase Program		5,631,460	5,662,948
Real Estate [Member] | Farmland [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		590,896	598,898
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		222,196	217,145
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		326,915	329,593
Total loans, including Warehouse Purchase Program		$ 326,915	$ 329,593
[1] Includes $ 6.4 million and $ 5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023 , respectively.

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Percentage of Loans Related to Single Industry on Loans	10%		10%
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans	82.30%		83%
Loans and Leases Receivable, Related Parties	$ 290,000		$ 292,000	$ 547,000
Loans held for investment	$ 20,393,943,000		$ 20,352,559,000
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate	0.39%		0.34%
Loans and leases receivable, nonaccrual loans	$ 78,500,000		$ 68,700,000
Financing Receivable, Allowance for Credit Losses on Loans	$ 330,200,000		$ 332,400,000
Allowance for Credit Losses as Percentage of Loans	1.55%		1.57%
Provision for credit losses	$ 0	$ 0
Decrease in allowance for credit losses for loans	$ (2,100,000)
Decrease in allowance for credit losses for loans, percentage	(0.60%)
Net (charge-offs) recoveries	$ (2,143,000)	$ 615,000
General reserve	4,100,000
Allowance for credit losses on off-balance sheet credit exposures	36,503,000		$ 36,503,000
Commitments expected to fund	2,260,000,000
Nonaccrual loans	78,475,000		68,688,000
PCD Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Net (charge-offs) recoveries	(991,000)
Nonperforming Financial Instruments [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	$ 83,800,000		$ 72,700,000

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Related Party Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Beginning balance on January 1	$ 292	$ 547
New loans	1	64
Repayments	(3)	(319)
Ending balance	$ 290	$ 292

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 21,091,342	$ 21,002,310
Nonaccrual loans		78,475	68,688
Total loans		21,265,247	21,180,538
Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		92,395	107,345
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		3,035	2,195
Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		95,430	109,540
Warehouse Purchase Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		864,924	822,245
Total loans		864,924	822,245
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		805,706	806,011
Nonaccrual loans		3,286	1,460
Total loans		813,092	816,043
Agriculture [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		3,672	8,572
Agriculture [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		428
Agriculture [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		4,100	8,572
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,844,761	3,038,559
Nonaccrual loans		14,749	14,770
Total loans		2,876,588	3,076,591
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		17,078	21,627
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing			1,635
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		17,078	23,262
Real Estate [Member] | Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans		813,092
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	8,214,494	8,103,904
Nonaccrual loans	[1]	29,464	25,694
Total loans	[1]	8,281,420	8,168,078
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	37,462	38,350
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]		130
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	37,462	38,480
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,594,704	5,620,775
Nonaccrual loans		21,303	18,662
Total loans		5,631,460	5,662,948
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		13,036	23,511
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,417
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		15,453	23,511
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,440,401	2,281,762
Nonaccrual loans		9,542	8,066
Total loans		2,470,848	2,305,040
Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		20,715	14,782
Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		190	430
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		20,905	15,212
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		326,352	329,054
Nonaccrual loans		131	36
Total loans		326,915	329,593
Consumer and Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		432	503
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 432	$ 503
[1] Includes $ 6.4 million and $ 5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023 , respectively.

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 6,380	$ 5,734
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 6,380	$ 5,734

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 20,393,943	$ 20,352,559
Other real estate owned		$ 2,204	$ 1,708
Nonperforming assets to total loans and other real estate		0.39%	0.34%
Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate		0.41%	0.36%
Nonaccrual loans to total loans		0.37%	0.32%
Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans		0.38%	0.34%
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 81,510	$ 70,883
Repossessed assets		97	76
Other real estate owned		2,204	1,708
Total nonperforming assets		83,811	72,667
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1],[2]	78,475	68,688
Nonperforming Financial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 3,035	$ 2,195
[1] ASU 2022-02 became effective for the Company on January 1, 2023. There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Nonperforming Assets (Parenthetical) (Details) - USD ($)		Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 20,393,943,000	$ 20,352,559,000
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		81,510,000	70,883,000
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1],[2]	78,475,000	68,688,000
Troubled Debt Restructuring [Member] | Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member] | Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 0	$ 0
[1] ASU 2022-02 became effective for the Company on January 1, 2023. There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	$ 495,074	$ 533,653
Discount	(7,361)	(7,914)
Recorded investment	487,713	525,739
Non-PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	1,676,563	1,823,809
Discount	(18,681)	(19,992)
Recorded investment	$ 1,657,882	$ 1,803,817

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Summary of Changes in Accretable Yields of Acquired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
PCD Loans [Member]
Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]
Balance at beginning of period	$ 7,914	$ 3,361
Accretion recoveries (charge-offs)	(5)
Accretion	(548)	(339)
Balance at March 31,	7,361	3,022
Non-PCD Loans [Member]
Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]
Balance at beginning of period	19,992	2,233
Accretion recoveries (charge-offs)	1
Accretion	(1,312)	(532)
Balance at March 31,	$ 18,681	$ 1,701

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination/Renewal (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Impaired [Line Items]
2024		$ 1,436,156
2023		5,021,382
2022		2,122,994
2021		3,825,943
2020		3,006,481
Prior		4,179,751
Revolving Loans		1,632,109
Revolving Loans Converted to Term Loans		40,431
Total loans		21,265,247	$ 21,180,538
Current-period gross write-offs, 2024		1,470
Current-period gross write-offs, 2023		755
Current-period gross write-offs, 2022		33
Current-period gross write-offs, 2021		63
Current-period gross write-offs, 2020		73
Current-period gross write-offs, Prior		254
Current-period gross write-offs, Revolving Loans		953
Current-period gross write-offs, Total		3,601
PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2024		1,758
2023		172,461
2022		61,891
2021		69,943
2020		49,529
Prior		86,242
Revolving Loans		45,889
Total loans		487,713
Agriculture [Member]
Financing Receivable Impaired [Line Items]
Total loans		813,092	816,043
Warehouse Purchase Program [Member]
Financing Receivable Impaired [Line Items]
2024		864,924
Total loans		864,924	822,245
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2024		108,055
2023		860,865
2022		945,805
2021		430,233
2020		252,132
Prior		108,236
Revolving Loans		171,262
Total loans		2,876,588	3,076,591
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2024		1,218
2023		29,616
2022		98,450
2021		15,171
2020		7,649
Prior		7,371
Revolving Loans		20,391
Total loans		179,866
Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2024		24,932
2023		150,882
2022		193,915
2021		105,762
2020		67,195
Prior		134,535
Revolving Loans		135,777
Revolving Loans Converted to Term Loans		94
Total loans		813,092
Current-period gross write-offs, Prior		121
Current-period gross write-offs, Total		121
Real Estate [Member] | Agriculture [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		1,986
2022		2,532
2021		1,345
2020		14,558
Prior		2,630
Revolving Loans		2,693
Total loans		25,744
Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2024		110,434
2023		1,191,104
2022		2,283,692
2021		2,172,423
2020		1,032,953
Prior		1,393,290
Revolving Loans		94,563
Revolving Loans Converted to Term Loans		2,961
Total loans	[1]	8,281,420	8,168,078
Current-period gross write-offs, 2022		389
Current-period gross write-offs, 2020		33
Current-period gross write-offs, Prior		39
Current-period gross write-offs, Total		461
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		625
2022		4,243
2021		475
2020		469
Prior		2,121
Total loans		7,933
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2024		53,699
2023		461,847
2022		1,228,640
2021		909,352
2020		673,842
Prior		2,203,321
Revolving Loans		96,168
Revolving Loans Converted to Term Loans		4,591
Total loans		5,631,460	5,662,948
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2024		540
2023		13,613
2022		53,166
2021		49,281
2020		38,547
Prior		71,666
Revolving Loans		329
Total loans		227,142
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2024		239,312
2023		274,792
2022		311,267
2021		179,447
2020		67,902
Prior		312,993
Revolving Loans		1,052,361
Revolving Loans Converted to Term Loans		32,774
Total loans		2,470,848	2,305,040
Current-period gross write-offs, 2023		53
Current-period gross write-offs, 2022		349
Current-period gross write-offs, 2021		39
Current-period gross write-offs, Prior		24
Current-period gross write-offs, Revolving Loans		895
Current-period gross write-offs, Total		1,360
Commercial and Industrial [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		3,689
2022		14,070
2021		3,637
2020		661
Prior		2,439
Revolving Loans		22,462
Total loans		46,958
Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2024		34,800
2023		66,991
2022		58,063
2021		28,726
2020		28,970
Prior		27,376
Revolving Loans		81,978
Revolving Loans Converted to Term Loans		11
Total loans		326,915	$ 329,593
Current-period gross write-offs, 2024		1,470
Current-period gross write-offs, 2023		20
Current-period gross write-offs, 2022		17
Current-period gross write-offs, 2021		24
Current-period gross write-offs, 2020		0
Current-period gross write-offs, Prior		70
Current-period gross write-offs, Revolving Loans		58
Current-period gross write-offs, Total		1,659
Consumer and Other [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2021		34
2020		7
Prior		15
Revolving Loans		14
Total loans		70
Grade 1 [Member]
Financing Receivable Impaired [Line Items]
2024		11,726
2023		16,221
2022		4,853
2021		9,403
2020		29,040
Prior		12,471
Revolving Loans		52,538
Revolving Loans Converted to Term Loans		176
Total loans		136,428
Grade 1 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2024		720
2023		1,179
2022		1,231
2021		172
2020		252
Prior		369
Revolving Loans		8,590
Total loans		12,513
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		74
2022		153
2020		109
Total loans		336
Grade 1 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2024		6,392
2023		15,267
2022		9,372
2021		6,418
2020		2,811
Prior		6,188
Revolving Loans		41,360
Revolving Loans Converted to Term Loans		176
Total loans		87,984
Grade 1 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2024		4,614
2023		12,520
2022		5,465
2021		2,813
2020		1,681
Prior		5,914
Revolving Loans		2,588
Total loans		35,595
Grade 2 [Member]
Financing Receivable Impaired [Line Items]
2024		6,132
2023		24,577
2022		890
2021		473
2020		14,746
Prior		11,060
Revolving Loans		3,848
Total loans		61,726
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		1,106
2022		166
Prior		14
Total loans		1,286
Grade 2 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2023		13
2022		60
2021		101
Prior		722
Revolving Loans		46
Total loans		942
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		526
2022		1,243
2021		153
2020		236
Prior		2,602
Total loans		4,760
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		1,128
2020		459
Prior		2,232
Total loans		3,819
Grade 2 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		695
2022		7,799
2021		219
2020		195
Prior		3,651
Revolving Loans		2,295
Total loans		14,854
Grade 2 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2024		6,132
2023		12,406
2022		14,181
Prior		1,839
Revolving Loans		1,507
Total loans		36,065
Grade 3 [Member]
Financing Receivable Impaired [Line Items]
2024		1,384,010
2023		4,288,187
2022		1,752,316
2021		3,434,462
2020		2,694,771
Prior		2,938,298
Revolving Loans		1,376,075
Revolving Loans Converted to Term Loans		37,729
Total loans		17,905,848
Grade 3 [Member] | Warehouse Purchase Program [Member]
Financing Receivable Impaired [Line Items]
2024		864,924
Total loans		864,924
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2024		103,359
2023		745,828
2022		696,969
2021		364,477
2020		215,354
Prior		57,308
Revolving Loans		119,072
Total loans		2,302,367
Grade 3 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2024		20,051
2023		126,212
2022		168,180
2021		76,630
2020		47,924
Prior		118,858
Revolving Loans		102,641
Revolving Loans Converted to Term Loans		94
Total loans		660,590
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2024		109,256
2023		1,172,870
2022		2,253,123
2021		2,140,728
2020		1,021,887
Prior		1,310,779
Revolving Loans		91,597
Revolving Loans Converted to Term Loans		2,757
Total loans		8,102,997
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2024		50,492
2023		403,245
2022		908,841
2021		680,193
2020		405,589
Prior		1,246,771
Revolving Loans		77,627
Revolving Loans Converted to Term Loans		4,591
Total loans		3,777,349
Grade 3 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2024		211,874
2023		206,299
2022		222,945
2021		147,665
2020		49,661
Prior		187,230
Revolving Loans		910,134
Revolving Loans Converted to Term Loans		30,276
Total loans		1,966,084
Grade 3 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2024		24,054
2023		40,317
2022		38,129
2021		24,769
2020		11,901
Prior		17,352
Revolving Loans		75,004
Revolving Loans Converted to Term Loans		11
Total loans		231,537
Grade 4 [Member]
Financing Receivable Impaired [Line Items]
2024		31,392
2023		475,006
2022		259,716
2021		282,292
2020		209,728
Prior		929,581
Revolving Loans		139,245
Revolving Loans Converted to Term Loans		2,426
Total loans		2,329,386
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2024		3,478
2023		83,562
2022		146,216
2021		42,544
2020		5,572
Prior		26,944
Revolving Loans		30,782
Total loans		339,098
Grade 4 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2024		3,436
2023		21,435
2022		19,644
2021		25,993
2020		4,122
Prior		9,589
Revolving Loans		21,807
Total loans		106,026
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2024		1,178
2023		15,265
2022		15,813
2021		25,722
2020		5,681
Prior		64,138
Revolving Loans		2,871
Revolving Loans Converted to Term Loans		204
Total loans		130,872
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2024		2,667
2023		43,104
2022		262,140
2021		172,287
2020		217,796
Prior		716,336
Revolving Loans		15,857
Total loans		1,430,187
Grade 4 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2024		20,633
2023		44,614
2022		30,936
2021		14,641
2020		11,286
Prior		110,319
Revolving Loans		65,063
Revolving Loans Converted to Term Loans		2,222
Total loans		299,714
Grade 4 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2023		1,748
2022		257
2021		1,105
2020		15,259
Prior		2,255
Revolving Loans		2,865
Total loans		23,489
Grade 5 [Member]
Financing Receivable Impaired [Line Items]
2024		725
2023		27,727
2022		25,158
2021		11,713
2020		266
Prior		109,666
Revolving Loans		11,324
Revolving Loans Converted to Term Loans		100
Total loans		186,679
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		1,357
2020		23,373
Prior		15,796
Revolving Loans		769
Total loans		41,295
Grade 5 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2024		725
2023		57
2022		799
2021		885
Prior		1,143
Total loans		3,609
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		1,206
2020		119
Prior		2,517
Total loans		3,842
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2023		192
2022		2,538
2021		4,771
Prior		89,422
Revolving Loans		2,355
Total loans		99,278
Grade 5 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		17
2022		21,827
2021		6,057
2020		1,666
Prior		788
Revolving Loans		8,200
Revolving Loans Converted to Term Loans		100
Total loans		38,655
Grade 6 [Member]
Financing Receivable Impaired [Line Items]
2024		413
2023		4,286
2022		12,008
2021		8,793
2020		881
Prior		80,646
Revolving Loans		2,390
Total loans		109,417
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		570
2021		7,698
2020		184
Prior		561
Total loans		9,013
Grade 6 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2021		78
Prior		1,195
Total loans		1,273
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		357
2021		41
2020		19
Prior		1,840
Total loans		2,257
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2021		356
2020		11,451
Prior		76,088
Total loans		87,895
Grade 6 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2024		413
2023		311
2022		3,898
2021		615
2020		354
Prior		962
Revolving Loans		2,390
Total loans		8,943
Grade 6 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2022		31
2021		5
Total loans		36
Grade 7 [Member]
Financing Receivable Impaired [Line Items]
2023		12,917
2022		6,162
2021		8,864
2020		7,520
Prior		11,787
Revolving Loans		800
Total loans		48,050
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		183
2022		2,647
2021		343
Prior		242
Revolving Loans		248
Total loans		3,663
Grade 7 [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable Impaired [Line Items]
2022		1,469
2021		558
2020		339
Prior		29
Total loans		2,395
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		1,744
2022		7,554
2021		5,304
2020		4,433
Prior		9,293
Revolving Loans		95
Total loans		28,423
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2023		1,693
2022		827
2021		2,464
Prior		806
Total loans		5,790
Grade 7 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		3,900
2022		420
2021		195
2020		1,268
Prior		1,416
Revolving Loans		457
Total loans		7,656
Grade 7 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2020		122
Prior		1
Total loans		$ 123
[1] Includes $ 6.4 million and $ 5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023 , respectively.

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination/Renewal (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Impaired [Line Items]
Loans held for sale	$ 6,380	$ 5,734
Residential Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Loans held for sale	$ 6,380	$ 5,734

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses - Allowance for Credit Losses on Loans by Category of Loan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	$ 332,362	$ 281,576
Charge-offs	(3,601)	(2,191)
Recoveries	1,458	2,806
Net (charge-offs) recoveries	(2,143)	615
Allowance for credit losses on loans, ending balance	330,219	282,191
Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	11,380	7,699
Provision for credit losses	1,270	356
Charge-offs	(121)
Recoveries		6
Net (charge-offs) recoveries		6
Allowance for credit losses on loans, ending balance	12,627	8,061
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	87,775	78,853
Provision for credit losses	(5,619)	1,695
Recoveries	2	13
Net (charge-offs) recoveries	2	13
Allowance for credit losses on loans, ending balance	82,158	80,561
Real Estate [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Recoveries	98
Net (charge-offs) recoveries	(23)
Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	77,652	60,795
Provision for credit losses	2,469	1,603
Charge-offs	(461)	(65)
Recoveries	4	205
Net (charge-offs) recoveries	(457)	140
Allowance for credit losses on loans, ending balance	79,664	62,538
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	88,664	66,272
Provision for credit losses	(1,468)	1,699
Charge-offs	0	0
Recoveries		1
Net (charge-offs) recoveries	17	1
Allowance for credit losses on loans, ending balance	87,213	67,972
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	59,832	62,319
Provision for credit losses	2,067	(6,495)
Charge-offs	(1,360)	(901)
Recoveries	1,077	2,373
Net (charge-offs) recoveries	(283)	1,472
Allowance for credit losses on loans, ending balance	61,616	57,296
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	7,059	5,638
Provision for credit losses	1,281	1,142
Charge-offs	(1,659)	(1,225)
Recoveries	260	208
Net (charge-offs) recoveries	(1,399)	(1,017)
Allowance for credit losses on loans, ending balance	$ 6,941	$ 5,763

Loans and Allowance for Cred_15

Loans and Allowance for Credit Losses - Schedule of Amortized Cost of Loans Experiencing Financial Difficulty and Modified (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total loans held for investment	0.05%	0.02%
Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 11,413	$ 4,233
Commercial and Industrial [Member] | Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 413
Construction, Land Development and Other Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total loans held for investment		0.02%
Construction, Land Development and Other Land Loans [Member] | Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost		$ 4,233
Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total loans held for investment	0.05%
Agriculture [Member] | Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 11,000

Loans and Allowance for Cred_16

Loans and Allowance for Credit Losses - Schedule of Loan Modifications (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Effect on Term Extension	Modified to a 7 year term
Construction, Land Development and Other Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Effect on Term Extension		Less than 12-month extension
Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Effect on Term Extension	Modified to a 2 year term

Fair Value - Fair Value Assets

Fair Value - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available for sale securities:
Available for sale securities, at fair value	$ 315,300	$ 438,588
Corporate Debt Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	15,845	21,787
Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities, at fair value	315,300	438,588
Fair Value, Measurements, Recurring [Member] | Loan Customer Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	4,330	3,899
Fair Value, Measurements, Recurring [Member] | Financial Institution Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	4,309	3,876
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	15,845	21,787
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	256	218
Fair Value, Measurements, Recurring [Member] | Forward Mortgage-Backed Securities Trades [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	74	161
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	8	1
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	315,300	438,588
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Loan Customer Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	4,330	3,899
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Institution Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	4,309	3,876
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	15,845	21,787
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	256	218
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Mortgage-Backed Securities Trades [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	74	161
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	8	1
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]
Available for sale securities:
Available for sale securities, at fair value	194,806	320,044
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	194,806	320,044
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	104,649	96,757
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	$ 104,649	$ 96,757

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Other real estate, additions	$ 969
Real estate owned outstanding	845
Additions to impaired loans	$ 13,400
Impaired loans outstanding		$ 13,400

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 1,086,444	$ 458,153
Federal funds sold	250	260
Held to maturity securities	10,478,359	10,984,598	$ 10,984,598
Loans held for sale	6,380	5,734
Loans held for investment	20,393,943	20,352,559
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,648,983	17,403,237
Other borrowings	3,900,000	3,725,000
Securities sold under repurchase agreements	261,671	309,277
Carrying Amount [Member]
Assets
Cash and due from banks	1,086,444	458,153
Federal funds sold	250	260
Held to maturity securities	11,985,838	12,365,308
Loans held for sale	6,380	5,734
Loans held for investment, net of allowance	20,063,724	20,020,197
Loans held for investment	864,924	822,245
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,648,983	17,403,237
Other borrowings	3,900,000	3,725,000
Securities sold under repurchase agreements	261,671	309,277
Estimated Fair Value [Member]
Assets
Cash and due from banks	1,086,444	458,153
Federal funds sold	250	260
Held to maturity securities	10,478,359	10,984,598
Loans held for sale	6,380	5,734
Loans held for investment, net of allowance	18,465,513	18,321,054
Loans held for investment	864,924	822,245
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,611,669	17,371,523
Other borrowings	3,876,545	3,725,000
Securities sold under repurchase agreements	261,621	309,245
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Cash and due from banks	1,086,444	458,153
Federal funds sold	250	260
Estimated Fair Value [Member] | Level 2 [Member]
Assets
Held to maturity securities	10,478,359	10,984,598
Loans held for sale	6,380	5,734
Loans held for investment	864,924	822,245
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,611,669	17,371,523
Other borrowings	3,876,545	3,725,000
Securities sold under repurchase agreements	261,621	309,245
Estimated Fair Value [Member] | Level 3 [Member]
Assets
Loans held for investment, net of allowance	$ 18,465,513	$ 18,321,054

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Beginning balance	$ 3,396,086	$ 3,231,636	$ 3,231,636
Goodwill, First Bancshares Merger	316		164,450
Goodwill, Ending balance	3,396,402		3,396,086
Core Deposit Intangibles, Beginning balance	63,994	51,348	51,348
Core Deposit Intangibles, Amortization	(3,237)	$ (2,374)	(12,676)
Core Deposit Intangibles, First Bancshares Merger			25,322
Core Deposit Intangibles, Ending balance	$ 60,757		$ 63,994

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule Of Intangible Assets And Goodwill [Line Items]
Impairment recorded on goodwill and core deposit intangibles	$ 0
Amortization expense related to intangible assets	$ 3,237,000	$ 2,374,000	$ 12,676,000
Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, useful life	10 years
Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, useful life	15 years

Goodwill and Core Deposit Int_5

Goodwill and Core Deposit Intangibles - Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2024	$ 9,576
2025	11,409
2026	10,376
2027	9,288
2028	8,288
Thereafter	11,820
Total	$ 60,757	$ 63,994	$ 51,348

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) Plan shares	Mar. 31, 2023 USD ($)	Mar. 03, 2020 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock-based employee compensation plans | Plan	1
Total unrecognized compensation expense related to stock-based compensation arrangements | $	$ 28
Weighted-average period of cost expected to be recognized	1 year 11 months 12 days
Number of shares outstanding	0
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense | $	$ 3.4	$ 3.2
2020 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares authorized for issuance			2,500,000
2020 Stock Incentive Plan [Member] | Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares vested	406,757
2020 Stock Incentive Plan [Member] | Unvested Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share issued	540,297

Contractual Obligations and O_3

Contractual Obligations and Off-Balance Sheet Items - Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances (Details) - Guarantee Obligations [Member] $ in Thousands	Mar. 31, 2024 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 2,611,262
More than 1 year but less than 3 years	1,039,320
3 years or more but less than 5 years	299,314
5 years or more	1,623,325
Total	5,573,221
Payment Guarantee [Member] | Bank Term Funding Program [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	4,086,149
Total	$ 4,086,149

Contractual Obligations and O_4

Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) SubleaseArrangement	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
Operating lease right of use asset	$ 36,800
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Number of sublease arrangement | SubleaseArrangement	1
Sublease income	$ 869	$ 806
Operating lease, weighted average remaining lease term	5 years 8 months 12 days
Operating lease, weighted average discount rate, percent	2.90%
Operating lease, payments	$ 2,900	$ 2,800
Right-of-Use asset obtained in exchange for operating lease liability	2,100
Allowance for credit losses on off-balance sheet credit exposures	36,503		$ 36,503
Bank Term Funding Program [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Interest payable	$ 186,100
Minimum [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Lessee operating lease remaining lease term	1 year
Maximum [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Lessee operating lease remaining lease term	15 years

Contractual Obligations and O_5

Contractual Obligations and Off-Balance Sheet Items - Future Undiscounted Cash Payments Associated with its Operating Leases (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Leases [Abstract]
Remaining 2024	$ 7,877
2025	10,005
2026	8,865
2027	5,849
2028	2,873
2029	1,541
Thereafter	8,327
Total undiscounted lease payments	$ 45,337

Contractual Obligations and O_6

Contractual Obligations and Off-Balance Sheet Items - Summary of Commitments Associated with Outstanding Standby Letters of Credit and Commitments to Extend Credit (Details) - Guarantee Obligations [Member] $ in Thousands	Mar. 31, 2024 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 2,611,262
More than 1 year but less than 3 years	1,039,320
3 years or more but less than 5 years	299,314
5 years or more	1,623,325
Total	5,573,221
Standby Letters of Credit [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	62,745
More than 1 year but less than 3 years	18,559
3 years or more but less than 5 years	2,445
5 years or more	26
Total	83,775
Unused capacity on Warehouse Purchase Program loans [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	1,058,576
Total	1,058,576
Commitments to Extend Credit [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	1,489,941
More than 1 year but less than 3 years	1,020,761
3 years or more but less than 5 years	296,869
5 years or more	1,623,299
Total	$ 4,430,870

Other Comprehensive (Loss) In_3

Other Comprehensive (Loss) Income - Tax Effects Allocated to Each Component of Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity [Abstract]
Change in unrealized loss during period, before tax amount	$ (1,184)	$ (4)
Change in unrealized loss during period, tax effect	249	1
Change in unrealized loss during period, net of tax amount	(935)	(3)
Total securities available for sale, before tax amount	(1,184)	(4)
Total securities available for sale, tax effect	249	1
Total securities available for sale, net of tax amount	(935)	(3)
Total other comprehensive loss, before tax amount	(1,184)	(4)
Total other comprehensive loss, tax effect	249	1
Other comprehensive loss, net of tax	$ (935)	$ (3)

Other Comprehensive (Loss) In_4

Other Comprehensive (Loss) Income - Activity in Accumulated Other Comprehensive Loss Associated with Securities Available for Sale, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Beginning balance, accumulated other comprehensive income	$ (1,398)	$ (3,473)
Other comprehensive income (loss)	(935)	(3)
Ending balance, accumulated other comprehensive income	(2,333)	(3,476)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance, accumulated other comprehensive income	(1,398)	(3,473)
Other comprehensive income (loss)	(935)	(3)
Ending balance, accumulated other comprehensive income	$ (2,333)	$ (3,476)

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Notional Balances and Fair Value of Derivative Positions (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Interest Rate Lock Commitments [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	$ 15,693	$ 7,113
Derivative financial instruments, assets at fair value	256	218
Forward Mortgage-Backed Securities Trades [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	20,500	14,250
Derivative financial instruments, assets at fair value	8	1
Derivative financial instruments, liabilities at fair value	74	161
Commercial Loan Interest Rate Swaps and Caps [Member] | Loan Customer Counterparty [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	67,207	67,408
Derivative financial instruments, liabilities at fair value	4,330	3,899
Commercial Loan Interest Rate Swaps and Caps [Member] | Financial Institution Counterparty [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	67,207	67,408
Derivative financial instruments, assets at fair value	$ 4,309	$ 3,876

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Weighted Average Received and Paid Interest Rates for Interest Rate Swaps Outstanding (Details) - Commercial Loan Interest Rate Swaps and Caps [Member] - Loan Customer Counterparty [Member]	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Weighted-Average Interest Rate Received	3.07	3.07
Weighted-Average Interest Rate Paid	6.78	6.81

Derivative Financial Instrume_5

Derivative Financial Instruments - Additional Information (Details) - Interest Rate Swap [Member] - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Credit exposure	$ 4,300,000	$ 3,900,000
Cash collateral pledged	0	$ 0
Financial Institution Counterparty [Member]
Derivative [Line Items]
Credit exposure	$ 280,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Income (Loss) from Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest Rate Lock Commitments [Member]
Derivative Instruments Gain Loss [Line Items]
Derivatives not designated as hedging instruments	$ 38	$ 30
Forward Mortgage-Backed Securities Trades [Member]
Derivative Instruments Gain Loss [Line Items]
Derivatives not designated as hedging instruments	$ 196	$ (50)

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) $ in Thousands		3 Months Ended
	May 31, 2023 Office	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 3,396,402	$ 3,396,086		$ 3,231,636
Total assets		38,756,520	38,547,877
Loans		20,935,028	20,848,176
Total deposits		$ 27,175,518	$ 27,179,809
First Bancshares of Texas, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, equity interest issued or issuable, number of shares | shares		3,583,370
Payments to acquire businesses in cash		$ 91,500
Goodwill		164,800
Total assets				$ 2,140,000
Loans				1,650,000
Total deposits				$ 1,710,000
First Bancshares of Texas, Inc. [Member] | West, North and Central Texas [Member]
Business Acquisition [Line Items]
Number of full-service banking offices | Office	16
Lone Star State Bancshares Inc [Member]
Business Acquisition [Line Items]
Total assets		1,380,000
Loans		1,080,000
Total deposits		$ 1,240,000

Subsequent Event - Additional I

Subsequent Event - Additional Information (Details) $ in Thousands		3 Months Ended
	Apr. 01, 2024 Office	Jun. 30, 2024 USD ($) shares	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Subsequent Event [Line Items]
Assets			$ 38,756,520	$ 38,547,877
Loans			20,935,028	20,848,176
Total deposits			27,175,518	$ 27,179,809
Lone Star State Bancshares Inc [Member]
Subsequent Event [Line Items]
Assets			1,380,000
Loans			1,080,000
Total deposits			$ 1,240,000
Lone Star State Bancshares Inc [Member] | West Texas [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of banking offices | Office	5
Lone Star State Bancshares Inc [Member] | Forecast [Member]
Subsequent Event [Line Items]
Business acquisition, equity interest issued or issuable, number of shares | shares		2,376,182
Payments to acquire businesses in cash		$ 64,100